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  • 301.
    Lemaitre, Romain
    et al.
    ENSTIB/LERMAB, University of Lorraine, France.
    Bocquet, Jean-Francois
    ENSTIB/LERMAB, University of Lorraine, France.
    Schweigler, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bader, Thomas K.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Beam-on-foundation modelling as an alternative design method for timber joints with dowel-type fasteners: Part 1: Strength and stiffness per shear plane of single-fastener joints.2018In: 5th INTER Proceedings, 2018: International Network on Timber Engineering Research 2018, Karlsruher Institut für Technologie , 2018, article id 51-7-13Conference paper (Refereed)
    Abstract [en]

    Optimised manufacturing processes made possible the production of larger dimensions timber products, which allow for the design of remarkable structures. In the last version of the EN 1995-1-1, it seemed important to its drafters to propose design formulas to estimate stiffness of joints in accordance with the needs of that time. Aware of the technical jump that had to be managed, the proposed rules remained simple. However, simple design equations became insufficient to cope with present-day challenges, which are, e.g., related to the design of high-rise wooden buildings. In EN 1995-1-1, the resistant capacity of dowel-type timber joints is no longer determined by empirical formulas but it is based on the limit analysis proposed by Johansen (1949). This methodology however shows limits for complex joints even though many improvements have been made since its introduction (Blaß and Laskewitz 2000). In parallel with these analytical approaches, developments in computational mechanics made it possible to develop simple numerical methods (Foschi 1974, Hirai 1983), which taken even into account nonlinear phenomena. These approaches have remained unused in practical design due to their complex implementation and their high running time, at the time of their invention, while todays computational resources strongly reduced corresponding limitations. Thus, numerical modelling of connections can help engineers to fill the gaps of the EN 1995-1-1 and to cope with variability in connection design. For this purpose, dowel-type fasteners are numerically modelled as elastoplastic beams on a nonlinear foundation in engineered in wood-based products (Sawata and Yasumura 2003, Hochreiner et al. 2013). This method is called Beam-On-Foundation (BOF) modelling and shows huge potential for engineering design. The purpose of this paper is to show how this method can substitute and complement limit analysis and empirical stiffness formulas of timber joints with dowel-type fasteners.

  • 302.
    Lemaitre, Romain
    et al.
    University of Lorraine, France.
    Bocquet, Jean-Francois
    University of Lorraine, France.
    Schweigler, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bader, Thomas K.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Beam-on-Foundation Modelling as an Alternative Design Method for Timber Joints with Dowel-Type Fasteners: Part 2: Modelling Techniques for Multiple Fastener Connections2019In: INTER: International Network on Timber Engineering Research: Proceedings, Meeting 52, 26-29 August 2019, Tacoma, USA, Karlsruhe, Germany: Timber Scientific Publishing, KIT Holzbau und Baukonstruktionen , 2019, article id 52-7-9Conference paper (Refereed)
    Abstract [en]

    In many design codes for timber structures (e.g. Eurocode 5 and SIA 265), the stiffness of a connection is given by empirical equations for a single dowel-type fastener per shear plane. The global stiffness of the connection is then given by multiplication with the number of dowels and shear planes. In the codes cited above, the empirical equations to estimate stiffness only depend on two parameters, namely the dowel diameter and the wood density. The main difference between different codes and stiffness of different types of fasteners is the choice of the exponent on these two parameters. Development and background of empirical equations for stiffness in different codes were recently reported in Jockwer and Jorissen (2018), who analysed about one thousand double shear timber-to-timber connection tests to evaluate the influence of further parameters on stiffness, such as number of fasteners in a row, number of rows of fasteners and dowel slenderness. From this huge database, they have been able to estimate another empirical stiffness equation, that includes dowel slenderness as an additional parameter. Effects of the latter have even been reported in Lemaître et al. (2018), by using a phenomenological numerical model instead ofexperiments. Sandhaas and van de Kuilen (2017) reported that using the slip modulus Kser, calculated according to Eurocode 5 for stiffness prediction of multiple fastener joints, considerably overestimates the experimentally observed stiffness and they proposed to introduce an effective number of dowels in their design, which was also recommended in Jockwer and Jorissen (2018).

    This paper continues the work presented in Lemaître et al. (2018) on strength and stiffness estimations of single-fastener connections using a beam-on-foundation (BOF) modelling. In Lemaître et al (2018), the beam-on-foundation model calculations were compared to design equations of Eurocode 5, i.e. the load-carrying capacity and slip modulus. By these comparisons, the validity of the method for the design of single-fastener connections was highlighted. Moreover, effects that are not explicitly covered in the empirical design equations, namely the influence of the dowel slenderness and the nonlinear dowel diameter on the slip modulus were demonstrated.

    In the present paper, the same comparisons are made for multiple dowelled connections. Moreover, load distribution between dowels in this type of connection, which was shown to be non-uniform by Blass (1995), is studied by means of the BOF model. Different approaches to estimate the load distribution have been proposed by Cramer (1968), Lantos (1969) and Wilkinson (1986).

  • 303.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Flinkman, Matti
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Assessing corporate economic distress: a study of the wood construction industry2017In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 13, no 4, p. 594-601Article in journal (Refereed)
    Abstract [en]

    Wood buildings are considered as a viable option to support the effort minimizing the current housing shortage in Sweden. Companies trying to develop into this industry are needed to increase the use of prefabricated wooden elements, volumes or modules in an industrialized way. Suitable companies to make this development could be found amongst firms producing wooden single-family houses. These companies currently act on a highly competitive market with many companies offering relatively homogeneous products or services. Therefore, differentiation towards the wooden multi-family house industry could be considered as a long-term strategy, minimizing the economic distress and improving the survival of the company.The study is aiming at describing the development of economic distress and market concentration ratio in the Swedish industry for wooden single-family houses, for an eleven-year period from 2005 to 2015. The companies could be helped to understand, if and how the market concentration ratio and the economic distress are connected, linking company size to economic stability and efficient resource utilization. This will be conducted by applying Altman’s Z’-score model, grouping firms into a risk, a grey or a safe zone, combined with calculating the industry structure by means of the concentration ratio model. The required data were collected from the annual reports of the 51 relevant firms in the industry.

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  • 304.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Magnusson, Bengt
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Luu, Alan
    Ragnarsson, John
    Information Flow Optimisation: Enabling Standardisation towards Modular Building Methods of Wood-Building Solutions2018In: International Journal of Innovation, Management and Technology, ISSN 2010-0248, Vol. 9, no 6, p. 232-239Article in journal (Refereed)
    Abstract [en]

    Currently, there is a considerable lack of residential buildings in Sweden. Hence, companies that are active in the housing industry producing wood-building solutions have been affected by high demand for their products. The industry tries to be more effective, and one means of achieving this goal is to automate the production, similar to the automotive industry. However, improvements in the information flow have not come as far as developments in the production. Therefore, it is necessary to streamline the entire process and reduce the amount of manual work using rationalisation and automation to enhance competitiveness. This is not only applicable to the actual manufacturing process but also in a large degree to the design process, i.e. the transition from the basic to the detail design stage. The purpose of this research is to compare the information flow for various building projects before production, identifying development possibilities by using an improved information process.

    Information has been collected into a status report using interviews, surveys and from data in the Enterprise Resource Planning (ERP) system.

    Two areas were identified out of the status report: standard projects and special projects. The special projects constitute 90 % of the project departments actual workload, whereas standard projects do not exceed the projected lead times creating less problem than special projects. Therefore, the long-term development strategy for the industry should be to improve the level of project standardisation, developing an advanced modular system based on improved information flow minimising the need for special projects.

  • 305.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Identifying drivers facilitating product development within the industry for wooden multi-family houses2017In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 13, no 4, p. 602-609Article in journal (Refereed)
    Abstract [en]

    Sweden is forecasted to grow its population with 1.1 million people over the next eight-year period, increasing the demand on the construction phase of housing units throughout Sweden. However, at present, 240 of Sweden's 290 municipalities show an existing deficit of available housing units in their regions, resulting in inherent difficulties fulfilling this demand utilizing the current production structure. Therefore, further utilizing wood as a building material could contribute to minimize the gap, as well as fulfilling the EU’s goals towards the Europe 2020 strategy and the EU forest strategies, focusing on development towards innovation, bio-economy, sustainable sourcing and use of raw materials. This study is aiming to identify drivers supporting the Swedish industry of wooden multi-family houses to enable market growth through competitive and sustainable strategies. The representatives within the building process identify drivers, how they perceive their effect on the companies’ abilities to develop based on long-term and short-term strategic impact. Thus, the goal is to find ways in which wooden multi-family houses could compete as a building solution, compared to established solutions, thereby increasing the market share in Sweden. The methods used in this study is surveys distributed to representatives from municipalities, developers, contractors, architects and real estate companies.The result identifies three change drivers influencing the industry development for wooden multi-family houses in Sweden: technological-, knowledge- and environmental- drivers. These drivers have an effect on the companies’ ability for successful new product development and for development of sustainable strategies towards market growth for wooden multi-family houses.

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  • 306.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    The perceived end-user satisfaction of sound transmission and their willingness to pay for value creation2015In: Internoise, 9-12 August, 2015, San Francisco, Society of Experimental Mechanics (SEM) , 2015Conference paper (Other academic)
    Abstract [en]

    From a consumer perspective, living quality in the building itself is vital, e.g. as perceived sound transmissions between apartments could differ significantly for the inhabitants and thus, affects consumer satisfaction differently. This is important for the contractor when using wood as building material, in combination with developing cost efficient and profitable building solutions. The aim of this study is to investigate if end-users in lightweight and heavyweight buildings are satisfied with the standards in their apartments, especially considering the sound transmission between neighboring apartments and from the outside of the building to their apartment, and if they would accept higher costs for a better sound insulation, i.e. an additional value created.

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  • 307.
    Lindell, Emma
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Gröna tak och växtväggar - förutsättningar och effekter2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bruket att täcka in tak och väggar med växtlighet är något som ökar mer och mer. Klimatförändringar tvingar oss att förändra vårt förhållningssätt till naturen och tänka mer klimatsmart. Vidare skapar de hårdgjorda ytor som dominerar i städer problem med avrinning av regnvatten samt lokalt varmare miljöer som inte förekommer naturligt. Gröna tak och växtväggar skulle kunna vara en del av lösningen på dessa problem. Det här arbetet svarar på vilka typer av olika gröna tak och växtväggar som finns tillgängliga idag i Sverige samt vilken typ av grönt tak som går att använda vid olika sorters takläggning. Det undersöktes även hur gröna tak och växtväggar påverkar omgivningen och klimatet, lokalt och i viss mån globalt. Arbetet tar också upp hur vi människor påverkas av att ha gröna tak och växtväggar i den urbana miljön.

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  • 308.
    Lindfors, Hampus
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Cedmert, Philip
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Digital energistyrning av lägenheter - Är det lönsamt?2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Äldre flerbostadshus i dagens Sverige använder sig av väldigt mycket energi i onödan. Uppvidingehus är ett fastighetsbolag som anser att deras flerbostadshus har en hög energianvändning. Tre områden i Åseda granskas under denna studie för att se ifall ett digitalt energistyrningssystem kan förminska energianvändningen på dessa områden. Resultatet redovisar vilka byggnader som skulle kunna uppnå en lägre energianvändning och ifall det är lönsamt för ett mindre bostadsföretag att investera i ett digitalt energistyrningssystem.

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  • 309.
    Lindstam, Gustaf
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Larsson, Beatrice
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Optimized utilization of raw materials for production of Cross Laminated Timber: Quality of laminations and its effects on mechanical properties of multi-layer panels2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cross laminated timber (CLT) is a product increasingly demanded by the market. This has led to an interest among producers to further optimize the use of raw material. The aim of this investigation is therefore to analyze how the material properties in softwood lamellas, when used in different layers of a CLT plate, affect the stiffness and strength for CLT floor elements. This is done by analysis of CLT constructions with different dimensions, constructions and quality of lamellas. For the bending stiffness of CLT plates, the most important lamination property is the longitudinal modulus of elasticity. However, the stiffness to rolling shear of the lamellas has also large influence on the combined bending and shear stiffness of a CLT plate. The properties for the lamellas that has being used in this investigation are valid for Norway spruce (Picea Abies .L). For investigation and analysis of the lamellas and the CLT floors has Finite Element simulations by the software Abaqus (2017) along with hand calculations been used. A total of three different simulations were performed to accomplish the objectives set in this work.

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    bilaga
  • 310.
    Lindström, Lisa
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lätt, Julia
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Vad är en tillgänglig bostad?: En studie om funktionsanpassning i en bostad2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Många människor lever idag med någon form av rörelsenedsättning. Att planera en bostad bör till stor del handla om tillgänglighet och användbarhet där alla människor ska kunna leva på lika villkor oavsett behov. Det här arbetet undersöker om de lagar och regler som redan finns angående tillgänglighetsanpassning är tillräckliga och vad som krävs utöver detta med fokus på entré, badrum, kök samt brukarens sovrum. 

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  • 311.
    Luca, Matthieu
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Quality Timber Strength Grading: A prediction of strength using scanned surface grain data and FE-analyses2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
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    Report_MLuca
  • 312.
    Luu, Alan
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ragnarsson, John
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av informationsflödet hos ett företag med produktvariation: Fallstudie på A-hus AB2017Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie är att identifiera ett företags informationsflödet och ta fram förbättringsförslag. Företaget har en hög efterfrågan på deras produkter och en effektivisering av projekteringsarbetet gör att företaget lättare kan möta kommande utmaningar. Vid studier konstaterades det att problem skapas mellan arkitekt och konstruktör när det blir så kallat specialprojekt samtidigt som det saknades standardiserat arbete. Genom de presenterade förbättringsförslagen kan informationsflödet göra betydande effektiviseringar.

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  • 313. Lycken, Anders
    et al.
    Ziethén, Rune
    Bengtsson, Charlotte
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Development of a simulation-evaluation program for introducing and using output control in the sawmill industry2010In: Proceedings of the Final Conference of COST Action E53 “The Future of Quality Control for Wood & Wood Products”, May 4-7 2010, Edinburgh, UK, 2010Conference paper (Refereed)
  • 314.
    Lysén, Julia
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Lann, Evelina
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Energieffektivisering av skolbyggnader geom behovsstyrd ventilation2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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    Energieffektivisering av skolbyggnader genom behovsstyrd ventilation
  • 315.
    Machalická, Klára
    et al.
    Czech Technical University in Prague, Czech Republic.
    Sejkot, Petr
    Czech Technical University in Prague, Czech Republic.
    Eliášová, Martina
    Czech Technical University in Prague, Czech Republic.
    Nosné konstrukce ze skla a dřeva2016In: Materiály pro stavbu, ISSN 1213-0311, Vol. 22, no 2, p. 31-35Article in journal (Other academic)
    Abstract [cs]

    Rostoucí zájem o sklo jako konstrukční materiál vede k jeho uplatnění mimo jiné i v dřevěných konstrukcích, např. pro vnější fasádní prvky nebo sloupy či nosníky uvnitř budovy. Sklo je křehký materiál, ale dosahuje až šestkrát vyšší tuhosti než dřevo. Vhodnou kombinací obou těchto materiálů lze vytvořit takový kompozitní prvek, kde slabé vlastnosti jednoho materiálu (např. křehkost skla a nízká pevnost v tahu) lze vhodně doplnit vlastnostmi druhého materiálu (např. pevností dřeva v ohybu a duktilitou v tlaku).

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  • 316.
    Machalická, Klára
    et al.
    Czech Technical University in Prague, Czech Republic.
    Sejkot, Petr
    Czech Technical University in Prague, Czech Republic.
    Nechanický, Pavel
    Czech Technical University in Prague, Czech Republic.
    Hybridní konstrukce ze dřeva a skla2015In: Dřevostavby 2015, Volyně: VOŠ Volyně , 2015, p. 203-204Conference paper (Other academic)
    Abstract [cs]

    Dřevo i sklo jsou materiály, které vynikají svými estetickými vlastnostmi. V současné architektuře je sklo, stejně tak jako dřevo, stále častěji používáno na pohledově exponované nosné konstrukce. Protože sklo je křehký materiál, jsou vyvíjeny různé druhy hybridních konstrukcí, kde je sklo kombinováno s jinými materiály (např. beton, dřevo, ocel, hliník apod.) s cílem zvýšit únosnost prvku, dosáhnout bezpečného chování při porušení skla a současně zachovat vysokou míru transparentnosti. Výzkumem sklo-dřevěných konstrukcí se v současné době zabývá několik evropských univerzit, proto se tento článek zabývá touto problematikou.

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  • 317.
    Machalická, Klára
    et al.
    Czech Technical University in Prague, Czech Republic.
    Sejkot, Petr
    Czech Technical University in Prague, Czech Republic.
    Nechanický, Pavel
    Czech Technical University in Prague, Czech Republic.
    Hybridní konstrukce ze skla a dřeva2016In: TZB-info: portál pro technická zařízení budov, E-ISSN 1801-4399, Vol. 18, no 3, p. 5Article in journal (Refereed)
    Abstract [en]

    Timber and glass are the materials that have excellent aesthetic qualities. In current architecture, glass, as well as wood, are increasingly used for the visually exposed structures. Since glass is a brittle material, various types of hybrid structures are developed. Glass in hybrid element is combined with other material (eg. concrete, timber, steel, aluminium etc.) to increase load-bearing capacity and stiffness of the element, achieve safe failure behaviour together with high level of transparency. Nowadays, several European universities and research centres deal with the glass-timber load-bearing elements. This article provides an overview of the developed hybrid timber-glass structures including an experimental analysis of adhesive timber-glass joints, which was performed at Czech Technical University in Prague.

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  • 318.
    Madsen, Stine Skov
    et al.
    Technical University of Denmark, Denmark.
    Krenk, Steen
    Technical University of Denmark, Denmark.
    Johannesson, Björn
    Technical University of Denmark, Denmark.
    Relaxation modeling of asphalt behavior under moving load2015In: 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Crete Island: Technical University of Crete Chania Crete Greece, 2015Conference paper (Refereed)
    Abstract [en]

    In relation to the development of a Rolling Wheel Deflectometer (RWD), which is a non-destructive testing device for measuring pavement deflections, a finite element model for obtaining the soil/pavement response has been developed [1]. The RWD is operating at traffic speeds and the soil model is therefore subjected to a moving transient dynamic load. Perfectly Matched Layer (PML) [2] is used as absorbing boundary conditions in order to prevent reflections of the waves propagating through the soils due to the dynamic loading. As the load is moving with high speed, the formulation is in the moving frame of reference [3].

    To accurately predict pavement response, proper material characterization is needed. Flexible pavements are commonly modeled as multilayer linear elastic systems. However, asphalt behaves as a viscoelastic material because its response to induced loading depends on temperature and load frequency and can be modeled in different ways. A finite element model can quickly reach high computational cost, thus a simple, time-efficient viscoelastic model is preferable.

    The viscoelastic behavior of asphalt can be described by a relaxation format of the constitutive relation with four parameters; two elastic moduli defining the minimum and maximum stiffnesses of asphalt in relation to frequency, a time scale parameter controlling the relaxation time and a differential fractional order characterizing the interpolation between low and high frequency regimes [4]. Assuming the most common interpolation shape by setting the fractional order equal to one, the system is reduced to only 3 parameters and the formulation can be implemented in the finite element model without increasing the computational cost significantly.

    In this paper a formulation of the relaxation format of viscoelastic behavior is developed in translated coordinates with efficiently absorbing boundary conditions (PML). The viscoelastic properties of the formulation are illustrated through numerical examples.          

     

    References

    [1] S. Madsen, S. Krenk and O. Hededal, Perfectly Matched Layer (PML) for transient wave propagation in a moving frame of reference. Proceedings of the Fourth International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013, pp. 4379-4388. Kos, 2013.

    [2]  R. Matzen, An efficient finite element time-domain formulation for the elastic second-order wave equation: A non-split complex frequency shifted convolutional PML. International Journal for  Numerical Methods in Engineering, 88, 951-973, 2011.

    [3] S. Krenk, L. Kellezi, S.R.K. Nielsen and P.H. Kirkegaard, Finite elements and transmitting boundary conditions for moving loads, in Proceedings of the Fourth European Conference on Structural Dynamics, EURODYN’99, Vol. 1, 447-452. Balkema, Rotterdam, 1999.

     [4] S. Krenk, Damping mechanisms and models in structural dynamics. Proceedings of the Fourth International Conference on Structural Dynamics, EURODYN 2002, Vol 2, Munich, Germany, 2002.

  • 319.
    Magnusson, Martin
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Processmätning av kapsåg vid husfabrik: Fallstudie vid Svensk Husproduktion AB2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att undersöka hur en process i en tillverkningsindustri kan effektiviseras och få en ökad förståelse kring produktionsutveckling. Studien ska utvärdera utnyttjandegraden för en process hos en svensk träshustillverkare och undersöka processen för att kunna ge förslag på förbättringsåtgärder. Examensarbetet utfördes på Svensk Husproduktion AB som ligger i Bromölla och tillverkar prefabricerade småhus i trä. Tidsstudier har utförts dels på en operatör vid en arbetsstation, dels på maskinen som operatören arbetar vid. Syftet med tidsstudien är att få fram utnyttjandegraden på maskinen, samt att räkna ut operationstider för olika produktvarianter. När nuläget analyserades kunde forskaren konstatera att vid ökad produktion är den undersökta processen en flaskhals. Baserat på mätningar, observationer och intervjuer analyserades data och genom olika förbättringsförslag kan utnyttjandegraden vid processen öka till önskad nivå och flaskhalsen elimineras. Förbättringsförslagen utgår från att eliminera slöseri och öka andelen värdeskapande tid. Förslagen presenterades i två olika scenarier beroende på om företaget väljer att investera i robotautomation eller att förändra arbetsmetod och bemanning vid arbetsstationen. 

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    Processmätning av kapsåg vid Svensk Husproduktion AB
  • 320.
    Magyari, Mark
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Ebire, Oyebanji
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Lot, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Implementering av BIM i ett projektledningsföretag inom byggindustrin: Implementation of BIM in a project management company within construction industry2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Our main aim of this report is to create a foundation for understanding the meaning of BIM and explore the major contributions of BIM to construction design. One of the topics that we will be laying emphases on is the role and duties of a BIM-coordinator and different negative aspects that could be encountered when using BIM. So also presentation of different programmes (tools) used in the process of BIM-design.

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  • 321. Mahapatra, Krushna
    et al.
    Gustavsson, Leif
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Hemström, Kerstin
    Multi-storey wood-frame buildings in Germany, Sweden and the UK2012In: Construction Innovation, ISSN 1471-4175, E-ISSN 1477-0857, Vol. 12, no 1, p. 62-85Article in journal (Refereed)
  • 322.
    Mahapatra, Krushna
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Mainali, Brijesh
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Pardalis, Georgios
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Homeowners’ attitude towards one-stop-shop business concept for energy renovation of detached houses in Kronoberg, Sweden2018In: Innovative Solutions for Energy Transitions: 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China / [ed] Yan, J; Yang, HX; Li, H; Chen, X, Elsevier, 2018, Vol. 158, p. 3702-3708Conference paper (Refereed)
    Abstract [en]

    Based on an online questionnaire survey, this paper analyses the attitude of homeowners in Kronoberg, Sweden towards energy renovation and one-stop shop (OSS) services for the deep renovation of detached houses. Personal and contextual variables have been analysed to know who have renovation plan, what motivates them to renovate and if there is an interest in OSS concept. Results have shown that at present a very small section of the homeowners' have deep renovation plan. The priority is rather on aesthetic renovation than energy renovation. Younger homeowners below 36 years could be the first potential customer segment for deep renovation. The attitude towards OSS business concept of one entrepreneur-offering package solutions currently is not so encouraging. There is a need to demonstrate a cost-efficient OSS business concept for deep renovation ensuring the quality of the work to accelerate the deep renovation under such a business concept.

  • 323.
    Mainali, Brijesh
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Pardalis, Georgios
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Mahapatra, Krushna
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Criteria based approach for assessment of policy instruments for deep renovation of residential building in the Netherlands2019In: ECEEE Summer Study proceedings: eceee 2019 Summer Study on energy efficiency: Is efficient sufficient?, European Council for an Energy Efficient Economy (ECEEE), 2019, p. 599-606, article id 3-352-19Conference paper (Refereed)
    Abstract [en]

    The building sector is responsible for more than 40 % of the energy use and 32 % of carbon dioxide emissions in the European Union (EU). Previous research has shown that the present rate of energy retrofit and refurbishment in Europe is far below (<50 %) than that is required to meet the EU's building related energy efficiency goals for 2020. Appropriate policy interventions for deep renovation is perceived as a catalytic agent in promoting energy efficiency and leveraging more investments in the building sector. EU directives regarding Energy Efficiency reflects in various member states' national targets and policy measures to improve the energy performance of the existing building stocks. Economic policy instruments seem to be influential in steering the deep renovation market, but this alone may not be sufficient for the sustainable growth of the market. There is a need for market-based approach to enhance the private sector involvement, both in terms of technical and financial capabilities. This paper evaluates the policy instrument used for promoting deep renovation of residential buildings in the Netherlands. A "Theory-based evaluation" technique has been used in analyzing the content of the policy instrument, and the underlying theories and policies, at output and impact level. A set of the evaluation criteria have been applied for assessing such policy instruments in leveraging energy efficiency investments and their effectiveness in terms of energy savings. The assessments are done based on the meta-analysis of relevant literature and data sources, and finalized in consultation with the Dutch partners from INNOVATE (Integrated solutions for ambitious energy refurbishment of private housing) project under Horizon 2020. Further, the challenges for scaling up such existing effort for the sustainable growth of the deep renovation market has been explored.

  • 324.
    Mang, Herbert A.
    et al.
    Vienna University of Technology, Austria.
    Pichler, Bernhard
    Vienna University of Technology, Austria.
    Bader, Thomas K.
    Vienna University of Technology, Austria.
    Füssl, Josef
    Vienna University of Technology, Austria.
    Jia, Xin
    Vienna University of Technology, Austria.
    Fritsch, Andreas
    Eberhardsteiner, Josef
    Vienna University of Technology, Austria.
    Hellmich, Christian
    Vienna University of Technology, Austria.
    Quantification of structural and material failure mechanisms across different length scales: from instability to brittle-ductile transitions2012In: Acta Mechanica, ISSN 0001-5970, E-ISSN 1619-6937, Vol. 223, no 9, p. 1937-1957Article in journal (Refereed)
    Abstract [en]

    Structures may fail due to a myriad of different causes. Often, distinction is made between structural and material failure, that means a structure can fail, while the material is still intact (this is the case in so-called stability loss), or the material fails, which, as consequence, may lead to structural failure. The material behavior may turn out difficult to be mathematically guessed at the macro-level. On the other hand, a lot may be known about the chemistry or the microstructure of the material of interest. Herein, we aim at categorizing different scenarios which in the end provoke structural failure, discussing various cases investigated during the last five years, at the Institute for Mechanics of Materials and Structures of Vienna University of Technology: A well-chosen eigenvalue problem shows considerable potential for categorizing stability loss. We then turn to complex composite materials with a hierarchical organization, where a single constituent dominates the overall quasi-brittle failure of the material, such as lignin in wood and wood products, or the cement–water reaction products (shortly called hydrates) in cement-based materials. The picture changes if the first inelastically behaving constituent is related to ductile load carrying, then the loads within the microstructure are re-distributed before the overall material fails: this turns out to be the case in bone. Finally, due to highly confined multiaxial stress states, the elastic portion of the overall energy invested into the material may become negligible—and then yield design analysis employed on material volumes gives an idea of the highly ductile behavior of complex confined materials, such as asphalt. What integrates all the reported cases is the high capacity of mature mathematical and mechanical formulations to reveal the intricate, yet decipherable nature of the (continuum) mechanics of materials and structures.

  • 325. Mang, Herbert
    et al.
    Höfinger, Gerhard
    Jia, Xin
    Hofstetter, Karin
    Bader, Thomas K.
    Vienna University of Technology, Austria.
    Eitelberger, Johannes
    Pichler, Bernhard
    Scheiner, Stefan
    Ullah, S
    Zeiml, Matthias
    Amouzandeh, Aram
    Ring, Thomas
    Eberhardsteiner, Josef
    Hellmich, Christian
    Computational Civil Engineering Mechanics - Elucidating General Features of Materials and Structures2010Conference paper (Other academic)
  • 326.
    Merlo García, Ramón
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Glass-fibre reinforcement on steel to timber connections.: A parametric study through FEM modelling on double-shear single-dowelled connections.2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a context where timber is gaining popularity as a building material and glass-fibre reinforced composites (GFRC) are becoming more accessible in a wide variety of formats, it is considered appropriate to reconsider the combination of these two materials. Additionally, given the increasing use of laminated timber elements where stiffness and strength are better controlled, attention is drawn back to the connection between elements. For these reasons, it is considered of interest to study reinforcing possibilities for connections within timber structures.

    This work consists in a parametric study of a single-dowelled connection between a timber part and a slotted-in steel plate, reinforced wirh GFRC plates glued into the timber slot at both sides of the steel plate. The study was carried out through simulations in ABAAUS Finite Element Analysis software considering the effect of specimen's geometry and the fibre distribution within the GFRC.

    Results show the increase of stiffness for the different configurations and give an insight of what can be expected from such type of reinforcements.

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  • 327.
    Mmari, Winston
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Modeling of nailed timber connection: Displacement path dependency in sheathing-to-framing connections2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Connections in wood have been investigated and advanced ever since the ground-breaking work of Johansen in the early nineteenth century. Nevertheless, not much investigation has been undertaken on the existence of load-displacement path dependency in a sheathing-to-framing connection. Herein, a sheathing-to-framing connection is investigated in relation to displacement path dependency. This work uses 3D Finite Element beam-on-foundation models of an Oriented Strand Board (OSB/2) sheathing nailed to a C24 wood framing, to study possible strategies to numerically simulate the displacement path dependency. The models are used to study if non-linear elastic or elastic-plastic embedment properties of an annular-ringed shank nail in the wood-based materials bring about the path dependency using Connector elements in combination with different material models in the FE software Abaqus. Numerical results are compared with corresponding experimental test results of the connection together with the Eurocode 5 approach. The outcome of the numerical study both; confirms the existence of displacement path dependency and shows that this property in the connection can be described by plasticity properties in nail, sheathing material and the wood framing.

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  • 328.
    Mohammad, Hossam
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Riquelme, Leonardo
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Analys av prefabricerade installationsbjälklag i koncepthus2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ventilationssystem tar ofta mycket plats och kan beroende på utformning påverka

    bygghöjden. Studentbostäder kräver låga hyror och därmed låga produktionskostnader.

    Examensarbetet visar hur ventilationssystemet kan byggas in i ett innovativt

    installationsbjälklag och på så sätt spara bygghöjd. Lägre bygghöjd leder till lägre kostnader.

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  • 329.
    Mohammadianfar, Omid
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Imanizabayo, Lambert
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Study of the Bonding Properties for Timber – Glass Composite Beams: The influence of viscoelastic adhesives on the load-bearing capacity2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The study of the influence of viscoelastic adhesives on timber-glass composite beams addresses the development of new and innovative load bearing structures. Hybrid timber-glass beams, comprising of timber flanges and a glass web, were considered. The solutions proposed in this study are based on utilizing viscoelastic adhesive bond lines to obtain optimal structural interaction between timber and glass. For hybrid timber-glass beams, numerical simulations have been developed with Abaqus, Finite element software which are verified by analytical methods according to the Eurocode 5 (EN 1995). In this study, three different bond-line geometries and three adhesives (epoxy, silicone and acrylate) have been investigated. The beams were analyzed under four-point bending. This report summarizes theoretical investigations, background studies, numerical modelling and analytical solution that have been performed. Guidance is presented which can be used for the design of timber-glass composite beams. The study has shown that the viscoelastic properties of the adhesive had no significant influence for the selected epoxy adhesive, but it can slightly affect the beam behavior with the silicone and acrylate adhesives used. From the three geometries studied, the design with an epoxy bond-line on both sides and on top of glass is regarded the best way, leading to good load-bearing structural elements where the response of the adhesive was highly influenced by its near incompressible behavior.

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  • 330.
    Mohammed, Rana
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Ismail, Ahmed
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Hur köksutformning påverkar människors hälsa2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Köket utgör en essentiell del i hemmet. De trånga köken med låga arbetsbänkar följde kvinnorna långt in på 1950-talet, och skapade opraktiska och otrevliga arbetsmiljöer. Studier av olika arbetsmoment i kök gjordes av Carin Boalt och Brita Åkerman, för att på så sätt studera vad som behövdes och därmed skapa en bekväm arbetsmiljö utan tröttande och skadliga moment i arbetet. Dagens kök planeras baserat på olika krav och bestämmelser i avsikt att skapa bra funktioner och underlätta köksarbetet. Men frågan är om dessa, idag inte lika bindande, standarder och byggregler skapar ett rationellt och hälsosamt kök.Syftet med examensarbetet är att få djupare inblick i hur köksutformning utvecklades samt hur utformningen påverkar människors hälsa. För att nå detta studerades bl.a. resultat från Hemmens forskningsinstitut som undersökte köksarbete och dess rörelsemönster. Vidare intervjuades olika kökstillverkare, köksbrukare och en fysioterapeut. Resultatet visar att dagens köksstandard i huvudsak passar majoriteten av köksbrukarna som intervjuades, men statistik från Statistiska centralbyrån, SCB, visar att svenskars samtida medellängd inte passar standardhöjden i kök.

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  • 331.
    Molin, Olof
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Digitalt byggande2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
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  • 332.
    Movehede, Aidin Ramin
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Botic, Martin
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Fuktskador i skolor från 1970-talet i Växjö Kommun2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    På grund av bristande erfarenheter inom byggtekniken gällande fukt har många skolor byggda under 1970-talet fuktproblem idag. I uppdrag av Vöfab ska tre olika fuktskadade objekt som har renoverats jämföras med varandra. Objekten består av tre skolor i Växjö som är byggda under 1970-talet. Objektens fuktskador och åtgärder ska undersökas. Detta görs för att analysera om samma typ av åtgärder vidtagits samt om samma typ av fuktproblem uppkommit i alla tre objekten. I studien ska det med hjälp av det teoretiska ramverket även undersökas om ytterligare fuktproblem kan uppkomma i framtiden trots renoveringarna.

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    Examensarbete Byggteknik
  • 333.
    Music, Nermina
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lund, Hilda
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Energianalys av Sveriges största skola byggd med passivhusteknik2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In order to achieve Sweden's energy goals, the service sector needs to build energy-efficient buildings. Therefore, the national board of housing, building and planning proposed building regulations called BBR that consists of requirements and general recommendations for both new and existing building and contains multidimensional aspects including energy management in the building. Passive house building is also another promising solution to approach an energy efficient building. The main aim of this study is to assess the energy performance of a case study building according to the both BBR and passive house building criteria. Correspondingly, Elmeskolan, which has been built based on passive house standards, is chosen as the case study and a model is developed using a building energy-modelling program, VIP-Energy.

    The result of the energy calculation has been compared with the requirements of BBR 22 and 25 and the Passive House Standards. The study shows that the requirements for BBR and Passive House Standards were met for the case studied building.

    The primary energy demand of the heat supply system in the building is assessed by considering either geothermal or district heating system according to the Boverket’s energy management building regulations. It is concluded that the primary energy demand in case of using geothermal system is lower than district heating system to supply building heating demand.

    A simplified LCC analysis has been considered in this study due to the passive house standard and BBR 22 and 25 building regulations. The results show energy cost of the case studied building that is built based on passive house criteria is 25 % of total energy cost of similar building that built based on BBR 22 requirements. The results show the benefits of passive house requirements in comparison with BBR regulations for the case studied building in terms of thermo-economic objectives.

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  • 334.
    Nabioff, Lina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Salgueiro, Sigrid
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Ett studentbostadshus för att skapa integration mellan studenter i ett trivsamt boende med större gemenskap2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim has been to create a new student housing where there should be more togetherness between people who live in the residents. The house will have more common areas for the integration of students for a pleasant stay in Växjö.

     

    We have concentrated on finding and solving the interior design of the joint surfaces. The proposal consists of CAD- drawings.

    The student area is intended to be placed on the Brände udde, which is part of Campusvision 2005.

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  • 335.
    Ncube, Noah
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Sabaa, Stephen
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Non-uniformly distributed compression perpendicular to the grain in steel-CLT connections: Experimental and Numerical Analysis of bearing capacity and displacement behaviour2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Previous studies have mainly focused on the behaviour of timber under uniformly distributed compression perpendicular to the grain (CPG) loads. However, there are many practical applications in which timber is loaded by non-uniformly distributed CPG loads. Different design and test codes like the Eurocode 5 (EC5), DIN 1052:2004, ASTM D143- 94 and EN-408:2010 only account for load configurations where timber is subjected to uniformly distributed loads. For specific uniformly distributed load (UDL) configurations the bearing capacity of timber (solid softwood timber or Glulam) in compression is adapted by using a load configuration factor (kc,90) according to EC5, the European code for design of timber structures. EC5 has no guidelines for cross-laminated timber (CLT) under UDL with the exception of the Austrian National Regulations for EC5.

    In this work, an experimental and numerical study on the bearing capacity and displacement behaviour of CLT subjected to non-uniformly distributed loading (NuDL) is conducted on eight different load configurations. A steel-CLT connection in which the CLT is partially loaded is used in this study. Finite element modelling, performed using the commercial software Abaqus CAE is used as the numerical simulation of the experimental study and is validated by experimental results. Load configuration factors (kc,90) from experimental results are compared with values from the Swedish CLT handbook (KL-Trähandbok). The outcome of the study shows that load configuration factor for NuDL cases is higher than for UDL cases. Hence, for same load configurations a lower CPG strength is required in NuDL than in UDL. Moreover, numerical results feature overall good congruence with the elastic phase of the experiments and have the potential to augment experiments in further understanding other complex steel-CLT connections

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  • 336.
    Negreira, J
    et al.
    Lund University.
    Trollé, A
    Lund University.
    Jarnerö, Kirsi
    SP Technical Research Institute of Sweden, Vidéum Science Park, Växjö.
    Sjökvist, L.-G.
    SP Technical Research Institute of Sweden, Vidéum Science Park, Växjö.
    Bard, D
    Lund Univ..
    Psycho-vibratory evaluation of timber floors: Towards the determination of design indicators of vibration acceptability and vibration annoyance2015In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 340, p. 383-408Article in journal (Refereed)
    Abstract [en]

    In timber housing constructions, vibrations can be a nuisance for inhabitants. Notably, the vibrational response of wooden floor systems is an issue in need of being dealt with more adequately in the designing of such buildings. Studies addressing human response to vibrations are needed in order to be able to better estimate what level of vibrations in dwellings can be seen as acceptable. In the present study, measurements on five different wooden floors were performed in a laboratory environment at two locations in Sweden (SP in Växjö and LU in Lund). Acceleration measurements were carried out while a person either was walking on a particular floor or was seated in a chair placed there as the test leader was walking on the floor. These participants filled out a questionnaire regarding their perception and experiencing of the vibrations in question. Independently of the subjective tests, several static and dynamic characteristics of the floors were determined through measurements. The ultimate aim was to develop indicators of human response to floor vibrations, specifically those regarding vibration acceptability and vibration annoyance, their being drawn based on relationships between the questionnaire responses obtained and the parameter values determined on the basis of the measurements carried out. To that end, use was made of multilevel regression. Although the sample of floors tested was small, certain clear trends could be noted. The first eigenfrequency (calculated in accordance with Eurocode 5) and Hu and Chui׳s criterion (calculated from measured quantities) proved to be the best indicators of vibration annoyance, and the Maximum Transient Vibration Value (computed on the basis of the accelerations experienced by the test subjects) to be the best indicator of vibration acceptability.

  • 337.
    Nicklisch, Felix
    et al.
    Technische Universität Dresden, Germany.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Weller, Bernhard
    Technische Universität Dresden, Germany.
    Serrano, Erik
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Joint study on material properties of adhesives to be used in load-bearing timber-glass composite elements2014In: Glass | Facade | Energy / [ed] Jens Schneider, Bernhard Weller, Technische Uni Dresden , 2014, p. 271-280Conference paper (Refereed)
    Abstract [en]

    Beyond its transparency, glass offers a large potential to fulfill load-bearing functions. Timber-glass composite elements take advantage of the high stiffness and strength of glass. At the same time the post-breakage behavior of the composite element increases significantly compared to the brittle failure of a pure glass. The current study relates to timber-glass composites where the composite action is obtained via a linear bondline connecting the glass pane to a timber frame. The full potential of these composite elements arises from the use of adhesives of medium and high stiffness which exhibit rather small deformations compared to e.g. structural silicones. A central objective of the research is the assessment and the optimization of the bondline properties with respect to stiffness of the adhesive. The paper summarizes the results of an in-depth study on commercially available adhesives and evaluates their general suitability in timber-glass composites.

    The material properties of the adhesives were determined by thorough mechanical testing of the bulk material in the first place under varying conditions, typically encountered in façades. The potential use in glass-timber composites was then evaluated using small bonded specimens comprising birch plywood or massive pine wood in combination with soda-lime glass. Failure modes were categorized in order to ascertain the influence of the timber strength on the load-bearing capacity.

    In order to guarantee reliable results from various sources, parts of the tests were executed repeatedly at different laboratories. Results were compared and validated throughout the project. Hence the results of this study provide a reliable basis for material models used in e.g. numerical analysis and engineered design solutions. The study presented here is part of the WoodWisdomNet project “LBTGC - Load Bearing Timber Glass Composites”

  • 338.
    Nilsson, Elin
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Rebecca, Calderon
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Förväntningar och förbättringar på planlösning i flerbostadshus2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The survey has processed expectations and improvements on floor plans in a multi-family house. A survey by the public and residents in Vikaholm, Växjö, and interviews with experts were made to get views of improvements. Also interviews with residents were also made to get more developing and motivational answers than just from the opinion poll.

    The design and layout of the planning has been designed according to the desires and views expressed in the survey. The plan solutions are highly space-efficient and are designed with regard to, inter alia, intangible values that exist in a dwelling, which is spatial qualities that are less obvious and difficult to quantify.

    Different items such as comfort, better furnishing and more storage have made the accommodation a different design than the original floor plans. Flexible and general spaces that meet design requirements and have no unnecessary surfaces have been the aim of the work.

    The results of the work can be used for other future floor plans than for the multi-family house that has been the basis for this degree project.

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  • 339.
    Nilsson, Henrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Andersson, Sixten
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Slitage i studentbostäder2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Deta examensarbete undersöker slitaget i Växjöbostäders studentlägenheter genom att genomföra en enkätundersökning och att göra ekonomiska bedömningar av material för ytskikt.

    De ekonomiska bedömningarna görs med hjälp av livscykelanalys (LCC) och de material som analyserades var golv, väggbeklädnad och bänkskiva.

    Examensarbetet undersöker också andra faktorer som kan påverka slitage. 

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  • 340.
    Nilsson, Martin
    et al.
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Strömberg, Erik
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Parkett eller plastmatta, spelar det roll?2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IKEAs mål är att deras produkter ska vara för ”de många människorna”. För att bygga hus som passar ihop med detta måste det vara till kostnader som folk har råd med.

    Syftet med den här rapporten är att ta fram ett förslag på en yteffektiv lägenhet som kan sättas ihop till ett mindre flerbostadshus. Yteffektiva lägenheter gör att huset tar upp mindre plats på marken och därför kostar mindre per kvadratmeter. Med hjälp av detta hus kommer en jämförelse av kostnader för olika invändiga ytmaterial att utföras. Detta kommer användas för att se hur stor skillnad det blir på slutsumman om man till exempel väljer ”finare” ytmaterial, som parkett och klinker, istället för plastmatta.

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  • 341.
    Nilsson, Matilda
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Stövegård, Linn
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Flytande studentbostäder, baserat på Compact Living2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Arbetet behandlar en möjlig lösning på bostadsbristen, för dagens Studenter i form av flytande studentbostäder på vatten i ett modulkoncept. Vilket betyder att bostäderna kan förflyttas där bostadsbristen befinner sig.

    Utifrån metoden, System Development, har ett utformningsförslag av en flytande studentbostad lagts fram, baserat på Compact Living.

    Undersökningen baseras på litteraturstudier, observationer och intervjuer. Resultatet visar ett koncept, på hur flytande studentbostäder skulle kunna sättas samman i en modulenhet. 

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  • 342.
    Nilsson, Ted
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Jansson, Johan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Energieffektivisering av rekordårensflerbostadshus2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sandviksvägen 38 is one of many apartment buildings built during the years 1961 - 1975. The

    building faces a major renovation, which provides good opportunities to reduce building

    energy consumption. The study examines and describes energy saving actions that can be

    implemented. The goal is to propose actions that reduce the building's specific energy

    consumption by 20 or 50 percent compared to current use. Energy calculations of the actions

    have been examined with the program VIP-Energy and a simpler form of LCC-analysis have

    been performed to examine the actions total energy saving potential. The result can be used

    as a basis for future investment calculations.

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  • 343.
    Nylander, Ola
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jorga, Gabriel
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jämförelse av vingfundament och betongfundament2007Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Since the beginning of the 19-th century the technology with posts provide with wings have been developed and used for different objects and purposes. For three years ago the Swedish company Vingfundament Terrawing AB was founded by Roland Johansson and Johnny Mattsson. They develop and produce wing foundations for smaller constructions as for example road signs and noise displays. On a project on Revingehed in Skåne, Sweden Peab in Växjö has used the technology with wing foundations to lay the foundation of house coulisses, this is one of the biggest projects ever made with this technology. In normal case constructions like this would the foundation been laid with concrete foundation, a process that is slower and more expansive than wing foundations.

    Hand calculations have been done for the bearing of concrete foundations, these calculations have been checked with the calculations programme WIN-statik Grundplatta. The dimension of the concrete foundation we decided to try replacing the wing foundations with is 2,5*57*0,4 m, on this concrete plate pillar skaft is placed for each wall piece, the dimension of the pillar shafts is 0,35*0,35*1,1 m. On each pillar shafts is steel pillar assembled, on the steel pillars wall pieces are attached with a size 4,65*2,48 m. The concrete foundation is well enough for the vertical force but because of the big horizontal force we have to have this big dimension on the concrete foundation.

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  • 344.
    Nylander, Oskar
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Svensson, Sebastian
    Draghållfasthet i historiska träförband2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis was carried out to study tensile strength in pine dowels and cut nails in historical wooden joints. Today no standard of calculations for joints with pine dowels or cut nails exists. By performing tensile tests in combination with calculations according to both Swedish and international standard, the suitability of different formulas will be graded.

     

    The results show that the formulae have a tendency to underestimate the dowels probable tensile strength, although some of them could be applied according to what this study has shown. Further the behavior and strength between different diameter sizes and wooden parts vary unreliably since a greater dowel size didn’t always lead to a higher tensile strength. The same type of failure appeared in all of the joints.

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    Draghållfasthet i historiska träförband
  • 345.
    Nyqvist, Rose
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Anbudskalkyl mer användbar i byggprocessen2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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  • 346.
    Olsson, Anders
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Probabilistic Analysis and Optimization of Roof Trusses2010In: Electronic Journal of Structural Engineering, ISSN 1443-9255, E-ISSN 1443-9255, Vol. 10, p. 74-89Article in journal (Refereed)
    Abstract [en]

    The influence of gap between wooden members and displaced nail-plates in roof trusses is investigated by means of probabilistic calculations and structural optimization. The employed mechanical model, using the finite element method, captures the non-linear behaviour of the nail-plate joints. The joint stiffness involves the size and location of the nail-plate, and the presence of contact or gap respectively between the wooden members. The analysis shows that even small initial gaps considerably increase the deflection of a roof truss. Misplaced nail-plates also effect the deflection negatively, but it is also shown that the deflection can be significantly decreased, and the utilization of nail-plates improved, by optimizing the nail-plate positions with respect to critical load cases and requirements.

  • 347.
    Olsson, Anders
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Källsner, Bo
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Evaluation of shear modulus of structural timber utilizing dynamic excitation and FE analysis2012In: Proceedings of CIB -W18, 2012Conference paper (Refereed)
  • 348.
    Olsson, Anders
    et al.
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Källsner, Bo
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Oscarsson, Jan
    SP Sveriges Tekniska Forskningsinstitut.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Nytt paradigm för hållfasthetssortering av konstruktionsvirke: Projektrapport ett2013Report (Other academic)
    Abstract [sv]

    Den undersökning som redovisas i denna rapport har genomförts under hösten 2012 och våren 2013 inom projektet "Nytt paradigm för hållfasthetssortering av konstruktionsvirke". Projektet som kommer att pågå under perioden december 2011 till juni 2014 går ut på att för industriellt bruk utveckla en nyligen föreslagen metod för hållfasthetssortering av konstruktionsvirke, vilken baseras på laserskanning i kombination med dynamisk excitering och densitetsbestämning av virke. Projektet finansieras till 50 % av VINNOVA och till 50 % av de företag som medverkar i projektet, nämligen Innovativ Vision AB (IV), Vida Vislanda AB, Södra Timber AB, Derome Timber AB och Dynalyse AB. Linnéuniversitetet (Lnu) och SP Sveriges Tekniska Forskningsinstitut AB (SP) samverkar med nämnda företag i utförandet av forskningen.

    Syftet med undersökningen är i först hand att utvärdera alternativa sätt för att bestämma densitet för virke och att verifiera implementeringen av programvara för industriellt bruk. Syftet är också att ta fram ett utökat material för att bedöma vilken precision den nya sorteringsmetoden kan erbjuda och för att bedöma hur känslig den är för olika typer förändringar och störningar som kan uppkomma. Undersökningen bygger på ett begränsat material och en mer omfattande undersökning planeras för genomförande under senare delar av projektet.

  • 349.
    Olsson, Anders
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Källsner, Bo
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Oscarsson, Jan
    Linnaeus University, Faculty of Technology, Department of Building Technology. SP Sveriges Tekniska Forskningsinstitut.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Nytt paradigm för hållfasthetssortering av konstruktionsvirke: Projektrapport två2014Report (Other academic)
    Abstract [sv]

    Undersökningen som redovisas i denna rapport har genomförts under hösten 2013 och våren 2014 inom projektet "Nytt paradigm för hållfasthetssortering av konstruktionsvirke". Projektet, som pågår under perioden december 2011 till juni 2014, går ut på att för industriellt bruk utveckla en nyligen föreslagen metod för hållfasthetssortering av konstruktionsvirke, vilken baseras på laserskanning i kombination med dynamisk excitering och densitetsbestämning av virke. Projektet finansieras till 50 % av VINNOVA och till 50 % av de företag som medverkar i projektet, nämligen Innovativ Vision AB (IV), Vida Vislanda AB, Södra Timber AB, Derome Timber AB och Dynalyse AB. Linnéuniversitetet (Lnu) och SP Sveriges Tekniska Forskningsinstitut AB (SP) samverkar med nämnda företag i utförandet av forskningen.

    Ett syfte med undersökningen är att på ett stort material bestående av många olika virkesdimensioner verifiera de starka statistiska samband som sedan tidigare påvisats för ett begränsat antal plankor och dimensioner, mellan å ena sidan indikerande egenskaper som baseras på mätningar och beräkningar och å andra sidan böjstyrka, elasticitetsmodul och densitet. Ett annat syfte med undersökningen är att visa att nödvändig data kan samlas in av samma utrustning och under samma förhållanden som kommer att gälla vid framtida hållfasthetssortering baserad på den aktuella metoden. Slutligen är ett syfte att samla in och dokumentera data som kan användas för forskning och utveckling både inom och efter det att det aktuella projektet har avslutats.

  • 350.
    Olsson, Anders
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Oscarsson, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Johansson, Marie
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Källsner, Bo
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Dynamic excitation and higher bending modes for prediction oftimber bending strength2010In: Proceedings of the final conference of COST action E53, 2010Conference paper (Other academic)
    Abstract [en]

    The potential of utilizing eigenfrequencies corresponding to edgewise bending modes for predicting the bending strength of timber is investigated. The research includes measurements of axial and transversal resonance frequencies, laboratory assessment of density, static bending stiffness and bending strength of 105 boards of Norway spruce of dimensions 45×145×3600 mm. It is shown that Eb,1, (MOE based on the eigenfrequency of the first bending mode) gives a higher coefficient of determination to the bending strength than what Ea,1 (MOE based on the first axial eigenfrequency) does. It is also shown that eigenfrequencies corresponding to higher bending modes can be used in the definition of a new prediction variable, the modulus of inhomogeneity (MOI). This is a scalar value representing the lack of fit between the true, measured eigenfrequencies and the expected (assuming homogeneity) eigenfrequencies of a board. The results show that using the MOI as a third prediction variable, in addition to Eb,1 and density, increases the coefficient of determination with respect to bending strength from R2 = 0.69 to R2 = 0.75.

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