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  • 1.
    Abdula, Sham
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Oksman, Dan
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Attefallshus som komplementbostadshus: Drömhus eller mardröm?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den 2 juli 2014 blev det enligt lag tillåtet för en- och tvåbostadshusägare att uppföra en bygglovsbefriad komplementbyggnad på max 25 kvadratmeter på den egna fastigheten. Rapporten undersöker vilket genomslag lagändringen har haft i Stor-Stockholm, Stor-Göteborg och Stor-Malmö. Undersökningen visar att lagändringen ännu inte har haft något stort genomslag. I rapporten undersöks även en utvald del av marknadsaktörers utbud av attefallshus avsett som komplementbostadshus. 

    Ett attefallshus utformas med miljövänligt hållbara material och inspireras av Vitruvius tre principer för god arkitektur. Huset konstrueras med avsikt att uppfylla kraven som ställs i PBL, PBF, BBR och EKS. Målet med de framtagna bygghandlingarna är att få startbesked från byggnadsnämnden i Växjö. 

  • 2.
    Akter, Shaheda
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bader, Thomas K.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Failure envelope for interaction of stresses perpendicular to the grain with rolling shear stress in wood2018In: 6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK, 2018Conference paper (Refereed)
    Abstract [en]

    The orthotropic material property in combination with ductility in compression, brittleness in shear and tension, very low shear modulus in radial-tangential (RT) plane etc. requires anisotropic stress failure criteria, as well as their evolution with increasing strains. Three- dimensional failure criteria have been proposed for this purpose, but their validation in the RT plane with interaction of rolling shear stresses has attracted less attention. Corresponding stress interactions are however important for modelling of engineered wood-based products under compression perpendicular to the grain when taking into account influence of the annual ring structure.

    The work aims at defining failure envelopes for stresses perpendicular to the grain with rolling shear stress interaction based on experimental investigations performed on Norway spruce. The experimental set-up was realized in a biaxial testing frame and consisted of stiff steel plates to transfer load from the testing machine to wood specimen. Mechanical grips prevented rotation and uplifting of the specimen in case of pure shear and tensile loading, respectively. In addition to conventional linear variable differential transformers, a digital image correlation system was used to measure strain fields on the surface of wood specimens and steel plates. Measurements of dog-bone shaped specimens were carried out along different stress interaction paths by displacement controlled loading.

    The experimental dataset was then compared with commonly used phenomenological failure criteria, namely Tsai-Hill, Tsai-Wu [1], Norris [2] and Hoffman, as well as with regression equations from previous works [3].Experiments revealed that the stress-strain relationship under compression, shear, and biaxial loading differs in radial and tangential directions. None of the three-dimensional stress failure criteria provided good prediction of experiments under compression and rolling shear, but experimental data was closer to the regression equation proposed in [3].

  • 3.
    Al Jaafar, Jaafar
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Projektering av platsbyggd villa2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract (in English)

    "This thesis work is a design project of an on-site construcktions. The issue addressed by the project was how to

    devise and design an detached house

    I have examined which architecture-drawings, construcktion-drawings and static calculations are needed to

    produce an on-site construcktions detached house.

    The result is presented in the finished drawings for the construction documents, which show a one-storey

    detached house with an attractive/accessible construction plan. It uses the combination of a strong style of

    architecture and a clear influence of functional design. This is clarified by the bench ceilings, and the facade,

    which is partly laying panel, partly white trimmed.

    Size: 153 square meters

    Number of rooms: 6, where of 3 are bedrooms."

  • 4.
    Al Jaafar, Jaafar
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Projektering av platsbyggd villa2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract (in English)

    "This thesis work is a design project of an on-site construcktions. The issue addressed by the project was how to

    devise and design an detached house

    I have examined which architecture-drawings, construcktion-drawings and static calculations are needed to

    produce an on-site construcktions detached house.

    The result is presented in the finished drawings for the construction documents, which show a one-storey

    detached house with an attractive/accessible construction plan. It uses the combination of a strong style of

    architecture and a clear influence of functional design. This is clarified by the bench ceilings, and the facade,

    which is partly laying panel, partly white trimmed.

    Size: 153 square meters

    Number of rooms: 6, where of 3 are bedrooms."

  • 5.
    Al-Ansari, Nabil
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Te Seng, Meng
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Studentbostäder i trä med Prefab-teknik2009Independent thesis Basic level (degree of Bachelor), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The Results of this thesis was the creation of two designed house variants with a module to

    all the apartments. In addition till the first module there are three other modules of

    apartments that can be put in the houses if it so needs. The house are volume prefabricated

    and are placed on site in a way that it create an enclosure of the area which faces against the

    nature and car parks also lies hidden behind these houses.

    For the actual structure, a cross beam was created to carry the floor above and it is support

    by all four walls. The structure between the first and the second floor has no "syll" but

    instead there are two differently alternative to linking the floors in order so that it will not

    move. The reason with this solution was that there will not be any subsidence when the

    forces from above are pressed down ward. The forces are instead directly down to the next

    timber frame system. This can happen when the real estate's owner might want to build

    more floors on the house than the present two floors house when there is no land to build

    and spaces are needed in the future.

  • 6.
    Albertsen, Henrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lindberg, Amanda
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lokalt omhändertagande av dagvatten på bostadsfastigheter2016Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [sv]

    Ett behov finns av att fördröja dagvatten innan det släpps på det kommunala ledningsnätet för att minska flödestopparna och undvika överbelastning. Studien avser att ta fram en förenklad metod för val och utformning av LOD-metod som är anpassad för privata fastighetsägare.

    Ett flertal LOD-anläggningar samt förutsättningar kring dessa har undersökts. Studien har gett en grundläggande information och en beräkningsgång som har förenklats, är lätt att följa och som kan anpassas efter befintliga förutsättningar och önskemål. 

  • 7.
    Algabroun, Hatem
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    On the development of a maintenance approach for factory of the future implementing Industry 4.02017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The objective of this thesis is to develop a maintenance approach that fulfills the requirements of Industry 4.0. It explores the role and importance of maintenance activities in today’s industry. Then, it develops the features and tasks required to be performed by maintenance to fulfill the demands of Industry 4.0. Finally, it develops a reference model to be used in designing maintenance system for Industry 4.0. To perform these studies, real data were collected and applied as well as a typical scenario was implemented.

    The results achieved in the papers of this thesis are 1) a mathematical representation and application of a model that identifies, analyses and prioritizes economic weakness in working areas related to production, 2) a model that analyses, identifies and prioritizes failures that impact the competitive advantages and profitability of companies, 3) characterization of a suitable maintenance technique for Industry 4.0 and 4) a reference model i.e. a framework, that could be utilized to develop a maintenance approach for Industry 4.0.

    The conclusion of this thesis confirms that maintenance has a significant impact on companies’ competitive advantages, other working areas and profitability. To achieve a suitable maintenance technique for Industry 4.0, this technique must be able to monitor, diagnose, prognosis, schedule, assist in execution and present the relevant information. In order to perform these tasks several features must be acquired, the most important features are to be: digitized, automated, intelligent, able to communicate with other systems for data gathering and monitoring, openness, detect deviation in the condition at an early stage, cost- effective, flexible for adding new CM techniques, provide accurate decisions and scalable. The developed framework could be used as a base to design a maintenance system for Industry 4.0. This study contributes to our understanding of the maintenance importance in today’s industry and how to develop a maintenance approach for Industry 4.0.

  • 8.
    Alriksson, Tobias
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Visualisering av byggprojekt i Revit2014Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [sv]

    Rapporten avhandlar visualiseringen i marknadsföringsstadiet av ett byggnadsprojekt med tillämpning på Trivselhus bostäder. För att få en grund till vad som ska ändras gällande företagets nuvarande visualisering har intervjuer genomförts med samtliga berörda parter. Dessa är säljare, kunder och husdesigners. Efter detta har två förslag till förändringar av nuvarande visualiseringar arbetats fram i Revit med intervjuerna som underlag.

  • 9.
    Andersen, Mattias
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Claeson, Martin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Utvärdering av ett nyutvecklat samverkansbjälklag och dess utvecklingspotential2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I dagens byggnader ställs allt högre krav på stora rum och öppna ytor vilket ger efterfrågan på ökad spännvidd hos bjälklagen. Detta är svårt att klara av med traditionella träbjälklag. För att ändå få ett lätt bjälklag undersöks möjligheten att kunna fördela ut bjälklagets belastning i två riktningar. Bjälklaget ska alltså vara fyrsidigt upplagt. För att lösa detta har en idé uppkommit som går ut på ett samverkansbjälklag mellan trä och plåt. Detta bjälklag ska i bärriktning 1 bära genom fackverkan medan det i bärriktning 2 ska bära genom balkverkan. För att ett fyrsidigt upplagt bjälklag ska fungera krävs att sambandet mellan kraft och deformation är likvärdigt i båda riktningarna.

    Examensarbetets uppgift har varit att tillverka provkroppar för att undersöka sambandet mellan kraft och deformation i både bärriktning 1 och bärriktning 2. Provning utförs för att se om bjälklaget har förutsättningar att kunna användas i praktiken.

    Efter provning av bjälklagsprovkropparna konstaterades att det finns möjligheter att gå vidare med produkten och fortsätta utvecklingsarbetet. För de provkroppar som provades i bärriktning 1 och 2 var sambandet mellan kraft och deformation nära identisk upp till 7,5 kN då mittnedböjningen var ca 10 mm.

  • 10.
    Andersson, Alexander
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bergman, Carl
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Underlag för fördelaktig upphängning av kylvattenledningar i en äldre byggnad2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Arbetet redovisar möjligheterna att hänga upp tyngre vattenledningar i en äldre industrilokal där en äldre byggnadsstandard användes vid uppförandet.

    Ett flertal alternativ har tagits fram och där de mest lämpade har arbetats vidare genom att jämföra fördelar och nackdelar.

  • 11.
    Andersson, Josefine
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Svensson, Simon
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mätning av fuktkvot i sammansatta KL-träelement2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Moisture related damage is an occurring problem in wood-based buildings if the material is exposed to rainfall during construction. Measurement of moisture content can be done with various instruments and methods. The purpose of the thesis is to study change in moisture content in cross-laminated-timber, with prolonged exposure to water in laboratory environment. To advance the field, the Linnaeus University has been developing a measurement instrument of their own in collaboration with the company Saab. The instrument measures electrical resistance in wood where the obtained values will be compared to similar measurements from a product named Gigamodule. The self-developed sensor card is still a product under development. In addition to the lab setting measurements the instrument was also installed in a local building in Växjö.

    To verify the result from the previously mentioned resistance measurers additional instruments and methods have been utilized. Two separate models have been used to represent the detail of the connection between the wall element and the joist. Both models have been submerged under water for an equal amount of time. The experimental setting took place between the 19th of April to the 18th of May 2018. The measurements and calculations have been resulting in values that can be the subject of internal evaluation. Difference in result based on the direction of the grain have been observed in several measurement methods. The CLT-elements demonstrated good drying properties despite periodically high moisture content and the wood indicate a return towards initial levels of moisture.

  • 12.
    Andersson, Magnus
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Cederholm, Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Alternativa byggsystem för att minska transmissionsförlusterna på miljonprogrammets byggnader2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose with this project is to explore and verify three renovating systems for Miljonprogrammet (common expression for

    buildings constructed during the years 1965-1975 when over a million houses where built in Sweden) to take measure to the

    largely transmission losses of these buildings. Many of the buildings from this period have similar constructions and therefore

    the same techniques can be used to renovate several of them. This project only considers the climate scale, although there

    are many more factors to concern for to efficient the buildings of Miljonprogrammet.

    This thesis presents examples of renovations carried out using two of the three renovation systems.

    The essay presents a reference house of choice on which we apply the three systems and calculate the new U-values,

    consumption of energy and the investment costs. The new U-values the building is given is matched to the values of

    recommendation for passive houses. Our reference house is a two story apartment building, located in the village of

    Lammhult, with brick facades at the ends and plaster at the long sides. One of the long sides contains balconies. The three

    systems are additional insulation, prefabricated additional insulation and replacement of the facade. We consider which

    renovation systems are best in different conditions, also considering the treatment of the tenants.

    The result of the study shows that with additional insulation and prefabricated additional insulation the buildings transmission

    losses will be major lowered. The investment cost and payoff time for the prefabricated version is much lower. If the standard

    of passive house is wanted the replacement of facade technique should be used. This method requires that the tenants move

    out during the renovation work. The investment cost for this method is significantly higher but the payoff time is equal with the

    additional insulation methods payoff time

     

     

    .

  • 13.
    Andersson, Mikael
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Energieffektivisering av kulturhistoriska byggnader: Energi och klimat i Lekaryd kyrka2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete syftar till att utreda inneklimat- och energisituationen i Lekaryd kyrka. För att göra detta har klimatmätning genomförts, samt simuleringar med datorsimuleringsprogrammet IDA – Klimat och energi. Kyrkan har höga energikostnader och för att få kännedom om energiförlusternas storlek och fördelning, har en kartläggning av kyrkans energiflöden genomförts i syfte att fastställa dess energibalans. Målet är att resultaten från klimatmätningen och datorsimuleringarna ska kunna användas som underlag vid utarbetande av åtgärdsförslag för en lönsammare och ur bevarandesynpunkt skonsammare drift av Lekaryd kyrka. Kyrkan värms intermittent vilket är skonsammare för kyrkan då långvariga variationer i den relativa fuktigheten undviks. Analysen av inneklimatet i kyrkan visar att den relativa fuktigheten ligger inom ett intervall där risk för uttorkningsskador och mögeltillväxt inte bör vara överhängande. De datorsimuleringar som har genomförts, innefattar simulering av kyrkans inomhusklimat och kyrkans energibalans. Vid datorsimulering av en tung stenkyrka är det viktigt att programmet tar hänsyn till väggarnas värmetekniska egenskaper för att ett bra resultat ska erhållas. Byggnadens värmelagrande förmåga tar programmet hänsyn till, men komplikationer uppstår när noggranna värden i relativa fuktigheten önskas. Resultatet från energisimuleringen pekar på att kyrkan dras med stora energiförluster i form av transmission genom byggnadsskalet, samtidigt som det visat sig att det passiva värmetillskottet från sol och intern transmission har en betydande inverkan på kyrkans aktiva uppvärmning.

  • 14.
    Andersson, Sören
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Risker med karbamidskumplast- och cellplastisolering i kulturhistoriskt värdefulla byggnader2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har genomförts på uppdrag av Länsstyrelsen i Blekinge och Ronneby Kommun och syftar på att utreda om tidigare tilläggsisolering med karbamidskumplast och polystyrencellplastkulor, på tre stycken byggnadsminnesförklarade byggnader på Ronneby Brunn i Blekinge, har medfört eventuella fuktskador. Undersökningarna av byggnaderna har utförts med ett antal valda undersökningsmetoder som var, okulär besiktning, termografering, klimatmätning, materialtest, fuktkvotsmätning elektrisk, fuktkvotsmätning med metoden vägning-torkning-vägning, samt simulerade fuktdiffusionsberäkningar. Efter att ha sammanvägt de olika undersökningsmetodernas resultat för respektive byggnad antas det att isoleringen inte utgör något hot för väggkonstruktionerna så länge de har en hög ånggenomsläpplighet och har tätt ytskikt på utsidan. Den förhöjda relativa fuktigheten som har noterats vid beräkningar av väggkonstruktionerna antas torka ut snabbt då konstruktionen har lågt ånggenomgångsmotstånd. De skador som upptäckts vid undersökningarna beror inte på byggnadernas isolering. Ett materialtest på karbamidskumplasten visar att fuktupptagningsförmågan är högre för material ifrån byggnaderna än från ett nyare material. Det innebär att om byggnaderna utsätts för inträngande vatten kan detta sugas upp kapillärt. Därför är det av vikt att den yttre tätningen som endast består av träpanel och färg har ett tätt skikt. Polystyrencellplasten antas däremot inte ha någon större kapillaritet alls. Då konstruktionerna har ett mycket begränsat värmemotstånd och vetskapen om att ogenomtänkta åtgärder kan skapa problem, bör det företas en kartläggning av byggnadernas möjlighet till att bli mer fuktsäkra och inte minst mer energieffektiva.

  • 15.
    Appelkvist, Rasmus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Persson, Patrik
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Utvärdering av ett nyutvecklat bjälklagsupplag för inhängda bjälklag2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In an effort to streamline processes and create a better standard, industrial construction has become increasingly common in the Swedish construction industry. Therefore, this thesis focuses on a unique proposal on floors for balloon systems, where the aim has been to investigate the possibility of a new type of bracket for balloon systems. The work will focus on the bearing capacity of the landfill and the establishment of a spring constant for this heap. This will be achieved through practical tests and simple calculations. The practical work relates to load the two prototypes of a new type of flooring warehouse to breach and then analyze the weaknesses in the structures. This degree will only consider the design and construction of a mounting profile designed to facilitate the slab types with varying span. The two prototypes have been stressed to breach, and the force and deflection have been measured to develop a spring constant. The laboratory results indicate that it is possible to use this heap profile in construction of light beams.

    Keywords: prefabricated construction, light beams, balloon systems, bracket for balloon systems and building systems for lightweight construction.

  • 16.
    Aronsson, Alexander
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Gustavsson, Markus
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Minimering av köldbryggor vid balkonger hos miljonprogramshus2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I studien görs en klimatsimulering av en byggnad från miljonprogrammet och jämförs sedan med en klimatsimulering där en ombyggnation av byggnadens indragna balkonger har gjorts.

    Studien ger konstruktionslösningar på hur en ombyggnation skulle kunna se ut.

    Resultatet visar att det går att minska energibehovet om balkongväggarna rivs och nya väggar konstrueras i liv med fasaden.

  • 17.
    Aronsson, Anton
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Andersson, Jesper
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Sjöberg, Mikael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Förskola i kombination med andra verksamheter: Vilka konsekvenser medför detta?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Växjö kommun har ont om ledig mark vilket har medfört att en undersökning harpåbörjats, där förskolor kombineras med andra verksamheter i en och sammabyggnad. Syftet har varit att undersöka möjligheten med dessa kombinationer för attse vilka konsekvenser som uppstår.

    Undersökningen behandlar två tomter i Växjö som har olika förutsättningar gällandedess detaljplaner. Resultatet visar att en kombination mellan de olika verksamheternaär möjligt men att dagens regler och standardiseringar inte alltid går att ta hänsyn tillvid dessa kombinationer.

  • 18.
    Assarsson, Jakob
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Eskilsson, Mattias
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Arbetsberedningar och Egenkontroller i produktionen: Work preparations and quality controls in production2009Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    I byggproduktionen behövs noggranna förberedelser för att undvika störningar och kvalitetsfel. En form av styrnings- och planeringsverktyg är arbetsberedningar och egenkontroller som vi i detta examensarbete har undersökt. Syftet har varit att se hur de fungerar och att finna förbättringsmöjligheter för dem. I arbetet gjordes en intervjustudie som visade att anställda på Peab tycker att arbetsberedningarna är ett mycket bra hjälpmedel i produktionen och att användandet fungerar ganska bra i nuläget. Enligt medarbetarna finns det dock mycket som kan utvecklas och förbättras. På företaget tycker personalen även att egenkontrollerna är något bra men själva användandet fungerar inte särskilt bra ute i produktionen.

     

    För att förbättra och utöka användandet av arbetsberedningarna krävs att tjänstemännen får en ökad förståelse och vilja att använda dem. När det gäller egenkontrollerna är det däremot hantverkarnas inställning som är bekymret, de ser inte kontrollen som något viktigt utan mer som ett moment som ödslar deras tid. Studien visar att egenkontrollen, om den används på rätt sätt, kan öka hantverkarnas engagemang och få dem att ta större ansvar för det de utför.

  • 19.
    Augustino, Daudi Salezi
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Adjei Antwi-Afari, Bernard
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Parameterized Modelling of Global Structural Behaviour of Modular Based Two Storey Timber Structure2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The global stiffness behaviour of modular-based two storey timber structures was studied under prescribed horizontal displacements at the upper corners of the volume modules. To be able to study this behaviour, a numerical finite element model was created in Abaqus. A parametric study was performed in which the geometry and spring stiffness of joints were varied until the enough stiff module was attained for safe transfer of shear forces through the module structure. The FE-model was parameterized to have possibility to vary positions of door and window openings in the volume modules. These openings had influence on the global structural behaviour of the two storey module structure since the side wall with two openings showed less reaction forces at its top corner point A compared to the other wall point B. In addition, the module#3 was assigned with small spring stiffness in x-direction representing friction in the joint between the volume modules. This was done without uplift plates and angle brackets. The findings showed that there was significant slipdeformation between the volume modules and small reaction forces at points A and B. The spring stiffness value in x-direction was varied until large value was obtained which resulted in overall shear deformations of the walls in both volume modules. When the angle bracket and the uplift plates were introduced between the modules when small spring stiffness along the joint between the volume modules was used, the results showed that most of the shear forces were transferred through the angle brackets instead of the fastener joints between the modules. Moreover, the results showed that the reaction forces at the points A and B increased when the angle brackets were assigned in the module. Furthermore, the results also showed that uplift plates used in the model worked well for simulations with low vertical spring stiffness between the modules.

  • 20.
    Augustsson, Tina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Söderberg, Emma
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sandgärdsgatan, Växjö: - En attraktivare gågata2006Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the outskirts of Växjö many shoppingmalls are vastly expanding which in time could pose a threat to the city centre. Växjö city is, in shoppingaspects dominated by one main street, Storgatan. To achieve a more competitive central part of the city and complex street network, a widening of the center would be preferred. Closest at hand for a widening of the city centre is the paralell pedestrian street Sandgärdsgatan, which today is thought of as a backstreet. Our project is to propose examples on how to turn Sandgärdsgatan into a more attractive pedestrian street. Research have been carried out in the form of literaturestudies, interviews and polls aswell as fieldtrips to various urban environments. The proposals we have created include everything from remodelling and general restorations to street markets and placarding. The main proposals aside from being presented in text are also visualised in drawings whilst smaller changes are only mentioned in text.

  • 21.
    Axelsson, Therese
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Hur följs kraven på tillgänglighet vid nybyggande av bostäder?: - En studie av utvalda bostadsprojekt i tre närliggande kommuner2008Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to find out how housebuilding meets the demands of availability for people with some sort of disability. The rules and demands of availability are stated in Boverkets byggregler, BBR and the Swedish standard, SS 91 42 21:2006 (publ.5). The projects in this study are compared to the rules and demands of BBR and SS 91 42 21:2006 (publ.5). The rapport studies three different house projects in three different municipalities and the result shows that only three of these nine projects meet the demands of availability for disabled people.

  • 22. Bader, Thomas K.
    Adaptability and Structural Design of Stadia2008Book (Other academic)
    Abstract [en]

    The aim of this master's thesis is to analyse recent developments in the design of stadia. In particular, the aim to make stadia adaptable in terms of use led to new challenges for the structural design. On one side, in order to increase event days per year, there are multi-purpose stadia for various sports, as well as for non-sporting events. Movable structures for seating tiers, pitches, and roofs developed for stadia that are suitable for various events. The design of these structures is discussed in this thesis. On the other side, major events require stadia with pre-determined capacities, which may be unsuitable for a long-term use. For this purpose, demountable structures for spectator accommodation are used to increase the capacity just temporary for the duration of a major event. Furthermore, general concepts for the structural design of stands and roofs are discussed. In addition, case studies of recent developments for major events, multi-purpose stadia, and stadia in the UK are analysed. Due to a study in the UK, there are British guidelines discussed in this thesis.

  • 23.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bocquet, Jean-Francois
    ENSTIB/LERMAB, University of Lorraine.
    Schweigler, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lemaitre, Romain
    ENSTIB/LERMAB, University of Lorraine.
    Numerical modeling of the load distribution in multiple fastener connections2018In: Design of Connections in Timber Structures: A state-of-the-art report by COST Action FP1402/WG3 / [ed] Carmen Sandhaas, Jorgen Munch-Andersen, Philipp Dietsch, Aachen: Shaker Verlag, 2018, p. 221-239Chapter in book (Refereed)
  • 24.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bocquet, Jean-Francois
    University of Lorraine, France.
    Schweigler, Michael
    Vienna University of Technology, Austria.
    Lemaitre, Romain
    University of Lorraine, France.
    Numerical modeling of the load distribution in multiple fastener joints2017In: International Conference on Connections in Timber Engineering – From Research to Standards: Proceedings of the Conference of COST Action FP1402 at Graz University of Technology / [ed] Reinhard Brandner, Andreas Ringhofer & Philipp Dietsch, Graz: Verlag der Technischen Universität Graz , 2017, p. 136-152Conference paper (Refereed)
    Abstract [en]

    Numerical modeling approaches, for the determination of load distribution in laterally loaded joints, as well as for the assignment of stiffness properties of joints for the structural analysis, are summarized in this contribution. The effect of the nonlinearity and the load-to-grain orientation dependence of connection slip, of elastic deformation in the surrounding wood matrix, and of the deviation between load and displacement direction are discussed. Comparison of various models demonstrates the pronounced effect of the load-to-grain orientation dependence and the nonlinearity in connection slip on the load distribution, particularly in case of moment loading. The effect of elastic deformation in the wood matrix on the load distribution increases with increased size of joints, even more pronounced when joints are loaded by a shear force perpendicular to the grain. In case of normal force loading, the non-uniform load distribution due to elastic deformation in the wood matrix reduces rapidly with increased relative joint displacement. Pros and cons of the modeling approaches as well as necessary input data are discussed in relation to the design process and European standardization.

  • 25.
    Bader, Thomas K.
    et al.
    Vienna University of Technology, Austria.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Esser, Gerold
    Vienna University of Technology, Austria.
    Hochreiner, Georg
    Vienna University of Technology, Austria.
    The Historical Roof Structure of the Leopold Wing of the Vienna Hofburg Palace: Structural Assessment2015In: Proceedings of the International Conference on Structural Health Assessment of Timber Structures (SHATIS'15), 2015Conference paper (Refereed)
    Abstract [en]

    In this case study, the structural behaviour of the historic roof structure of the “Leopold Wing”, part of the Hofburg, the Vienna Imperial Palace, is assessed. The current appearance of the roof is a consequence of several adaptions and extensions of the original structure that dates back to the 17th century. The main part of the roof was reconstructed in the early 1670s following a disastrous fire in February 1668. The structure had the shape of an M-roof consisting of two adjacent gable roofs. Probably in the 19th century, the centre part was closed, creating a mansard roof over the entire width of the building. Basically, the geometry of the structure is symmetric with respect to the middle wall. However, since the position of the middle wall is partly asymmetric, also the roof structure becomes asymmetric. Herein, the influence of the building history on the load-deformation behaviour of the roof structure is investigated. Therefore, structural analyses of the original M-roof and of the mansard roof are performed. The modelling of the historic roof structure is based on a deformation-accurate survey. In addition, the influence of the nonlinear, compliant behaviour of connections on the load-deformation behaviour of the timber structure is taken into account. A considerable influence of the connection slip on the deformation of the structure becomes obvious from the analysis. Consequently, consideration of the nonlinear behaviour of the joints reveals a realistic load transfer within the structure. The addition of structural elements caused additional dead loads, which increase long-term deformations.

  • 26.
    Bader, Thomas K.
    et al.
    Vienna University of Technology, Austria.
    Muszynski, Lech
    Oregon State University, USA.
    Integrative Method for Micromechanical Characterization of Wood in Steel-Dowel Connections2012In: COST Action FP 0802: Experimental and Computational Micro-Characterization Techniques in Wood Mechanics, Edinburgh, UK, 2012, p. 100-101Conference paper (Other academic)
  • 27.
    Bader, Thomas K.
    et al.
    Vienna University of Technology, Austria.
    Muszynski, Lech
    Lederer, Wolfgang
    Eberhardsteiner, Josef
    Imaging the Micromechanical Response of Wood in Steel-Dowel Connections2013Conference paper (Other academic)
  • 28.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology. TU Wien, Austria.
    Schweigler, M.
    TU Wien, Austria.
    Hochreiner, Georg
    TU Wien, Austria.
    Eberhardsteiner, Josef
    TU Wien, Austria.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Serrano, Erik
    Lund University, Sweden.
    Integrative Research for an Enhanced Design of Dowel Connections2015In: Proceedings of the EUROMECH Colloquium 556 on Theoretical, Numerical, and Experimental Analyses in Wood Mechanics, 2015Conference paper (Refereed)
  • 29.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Schweigler, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Numerical modelling of the rope effect in laterally loaded dowel-type connections2018In: 6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK, 2018Conference paper (Refereed)
    Abstract [en]

    Theory of laterally loaded dowel-type fasteners is well understood in relation to their bending deformation as a consequence of lateral embedment stresses in wood. Modelling of the so- called rope effect has however attracted less attention. The rope effect in laterally loaded connections is evoked by withdrawal resistance of the shank as well as by axial resistance of the head of the fasteners. It describes the development of tensile forces along the axis of the fastener, as a consequence of its bending deformation and axial constrains. Hilson [1] emphasized the pronounced contribution of frictional forces in the shear planes that contribute to increased strength of laterally loaded connections. The axial force component parallel to the shear plane however will only become significant for large relative displacements. Different kind of numerical models have been proposed for the simulation of dowel-type connections, including 3D FEM with elasto-plastic material models, with damage mechanics, or so-called foundation models. In this contribution, calculations with a beam-on-nonlinear foundation method [2] will be presented. The model was extended to account for increased lateral connection strength due to withdrawal resistance of fasteners. This was implemented in terms of axial springs that encompass a withdrawal force-relative displacement relationship, similar to the lateral springs that hold information on the embedment behaviour. Friction between the connected timber members was taken into account by the frictional coefficient times the force component perpendicular to the shear plane, which is a result of the axial force in the fastener.

    Calculations were performed for different types of dowel-type fasteners, including screws, smooth shank nails, annular-ringed shank nails and smooth dowels. Model predictions were compared to experimental data and showed good agreement. This encourages the use of the beam model for the engineering design of dowel-type connections in timber structures based on a deeper understanding of structure-connection relationships [3].

  • 30.
    Bader, Thomas K.
    et al.
    Technische Universität Wien, Austria.
    Schweigler, Michael
    Technische Universität Wien, Austria.
    Hochreiner, Georg
    Technische Universität Wien, Austria.
    Eberhardsteiner, Josef
    Technische Universität Wien, Austria.
    Berechnungsmodell für das Last-Verformungsverhalten von Stabdübelgruppen im Ingenieurholzbau2014In: Berichte der Fachtagung Baustatik-Baupraxis 12, München: Technischen Universität, München , 2014, p. 113-121Conference paper (Other academic)
    Abstract [de]

    In diesem Beitrag wird ein Berechnungsmodell für das Last-Verformungsverhalten von Stabdübelgruppen vorgestellt, mit dem lokale Verbindungsmittelkräfte und Verbindungsmitteldeformationen mit zugehörigen globale Schnittgrößen und Relativverformungen konsistent berechnet werden können. Grundlage dafür bildet das Last-Verformungsverhalten des Einzeldübels, das mit Hilfe eines baustatischen Modellierungsansatzes hergeleitet wird. Ein wesentlicher Eingangsparameter dieses Modells ist die Lochleibungsfestigkeit von Holz, die für beliebige Kraft-Faserrichtungen experimentell untersucht wurde. Mit Hilfe des vorgestellten Berechnungsmodells für Stabdübelgruppen können die Tragfähigkeit einer Verbindung unter einer beliebigen Kombination von Normalkraft, Querkraft und Momentenbeanspruchung und die zugehörige Relativverformung berechnet werden. Mit dem vorgestellten Berechnungsmodell kann der lastfallabhängige Einfluss einer Verbindung auf Schnittgrößen-Verformungsinteraktionen direkt in der baustatischen Berechnung von Holzkonstruktionen berücksichtigt werden.

  • 31.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Schweigler, Michael
    Technische Universität Wien, Austria.
    Hochreiner, Georg
    Technische Universität Wien, Austria.
    Eberhardsteiner, Josef
    Technische Universität Wien, Austria.
    Ingenieurmodelle für die Strukturmodellierung und Nachweisführung von stiftförmigen Verbindungen im Holzbau: (Engineering models for the structural design and verification of dowel-type connections in timber structures)2017In: Österreichische Ingenieur- und Architekten-Zeitschrift, ISSN 0721-9415, Vol. 162, no 1-12, p. 1-9Article in journal (Refereed)
    Abstract [en]

    Connections of elements in timber structures play an important role, not only due to their pronounced effect on the mechanical behavior of structures, but also due to the fact they can be decisive for the economic success of timber structures. Herein, approaches for a calculation of the ductile load-displacement behavior of dowel-type connections, of multi-dowel joints and of stresses in their timber matrix, by means of numerical methods, are presented. With these methods, kinematically compatible relative deformations of joints under arbitrary plane loading conditions and their effect on the mechanical behavior of timber structures can be reasonably predicted. The combination of the presented models and their integration in the structural analysis and the verification of timber structures lead to a more realistic prediction of their behavior (internal forces, stresses and deformations), as well as to a more economic design of timber structures. 

  • 32.
    Bader, Thomas K.
    et al.
    Vienna University of Technology, Austria.
    Schweigler, Michael
    Vienna University of Technology, Austria.
    Hochreiner, Georg
    Vienna University of Technology, Austria.
    Eberhardsteiner, Josef
    Vienna University of Technology, Austria.
    Load Distribution in Multi-Dowel Timber Connections under Moment Loading: Integrative Evaluation of Multiscale Experiments2016In: Proceedings of the 2016 World Conference on Timber Engineering (WCTE) / [ed] J. Eberhardsteiner, W. Winter, A. Fadai, M. Pöll, Vienna University of Technology, Austria , 2016Conference paper (Refereed)
    Abstract [en]

    The load distribution in multi-dowel timber connections under bending moments was investigated by means of an integrative evaluation of a hierarchically organized test program, which encompassed component tests as well as single dowel and multi-dowel connection tests. It was demonstrated that the anisotropic material behaviour of LVL, and consequently of wood in general, leads to a non-uniform distribution among the dowels.

  • 33.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology. Vienna University of Technology, Austria.
    Schweigler, Michael
    Vienna University of Technology, Austria.
    Hochreiner, Georg
    Vienna University of Technology, Austria.
    Eberhardsteiner, Josef
    Vienna University of Technology, Austria.
    Serrano, Erik
    Lund University.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Experimental Assessment of the Load Distribution in Multi-Dowel Timber Connections2016In: 17th International Conference on Experimental Mechanics, Rhodes, Greece, July 3-7, 2016, 2016Conference paper (Other academic)
    Abstract [en]

    An integrative, hierarchically organized testing procedure for the quantification of the load distribution in multi-dowel timber connections is presented herein. The use of contactless deformation measurement systems allowed the combination of test data from single dowel and multi-dowel connections, which gave access to the loads acting on each dowel over the full loading history. As a consequence of the anisotropic material behavior of wood, a nonuniform and progressively changing load distribution among the dowels was found.

  • 34.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology. Vienna University of Technology, Austria.
    Schweigler, Michael
    Vienna University of Technology, Austria .
    Hochreiner, Georg
    Vienna University of Technology, Austria .
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Serrano, Erik
    Lund University.
    Experimental characterization of the global and local behavior of multi-dowel LVL-connections under complex loading2016In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 49, no 6, p. 2407-2424Article in journal (Refereed)
    Abstract [en]

    The thorough experimental characterization of a dowel-type connection under various combinations of bending moments and normal forces is presented in this study. Double-shear steel-to-timber connections with 12 and 20 mm steel dowels were tested in a 4-point bending test set-up. The load, between the connected steel and wood beams, was transferred by the dowels themselves and also via an additional (passive) contact device, which introduced an eccentric normal force in the timber beam. The behavior of the connections was studied at the global scale of the connection and at the local scale of the individual dowels. A non-contact deformation measurement system was used to assess the changes of the location of the center of relative rotation over the entire loading. At the same time, the head deformations of the individual dowels could be measured, giving a direct indication about the force distribution among the dowels. Due to reinforcement, connections behaved distinctly ductile with a global relative rotation of up to 3°. Pre-stressing of the contact device by a force of 40 kN yielded an even stiffer behavior. For the particular configurations tested herein, the center of rotation was found to be close to the vertical axis of symmetry of the joint and close to the top row of the dowels. Moreover, the superimposed vertical shift of the center of relative rotation in case of a delayed normal force could be quantified. © 2015 RILEM

  • 35.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology. Vienna University of Technology, Austria.
    Schweigler, Michael
    Vienna University of Technology, Austria.
    Hochreiner, Georg
    Vienna University of Technology, Austria.
    Serrano, Erik
    Lund University, Sweden.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Dowel deformations in multi-dowel LVL-connections under moment loading2015In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 10, no 3, p. 216-231Article in journal (Refereed)
    Abstract [en]

    The aim of the experimental study presented herein is the assessment and quantification of the behavior of individual dowels in multi-dowel connections loaded by a bending moment. For this purpose, double-shear, steel-to-timber connections with nine steel dowels arranged in different patterns and with different dowel diameters were tested in four-point bending. In order to achieve a ductile behavior with up to 7° relative rotation, the connections were partly reinforced with self-tapping screws. The reinforcement did not influence the global load–deformation behavior, neither for dowel diameters of 12 mm nor for 20 mm, as long as cracking was not decisive. The deformation of the individual dowels was studied by means of a non-contact deformation measurement system. Thus, the crushing deformation, that is, the deformation at the steel plate, and the bending deformation of the dowels could be quantified. In the case of 12 mm dowels, the bending deformation was larger than the crushing deformation, while it was smaller in the case of 20 mm dowels. Moreover, dowels loaded parallel to the grain showed larger bending deformations than dowels loaded perpendicular to the grain. This indicates that the loading of the individual dowels in the connection differs depending on their location.

  • 36.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Vessby, Johan
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Modeling displacement path dependence in nailed sheathing-to-framing connections2017In: CompWood 2017 - Computational Methods in Wood Mechanics - from Material Properties to Timber Structures: Programme & Books of Abstracs / [ed] Josef Füssl, Thomas K. Bader, Josef Eberhardsteiner, Vienna: TU verlag , 2017Conference paper (Refereed)
  • 37.
    Bader, Thomas K.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Vessby, Johan
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Path dependence in OSB sheathing-to-framing nailed connection revealed by biaxial testing2018In: Journal of Structural Engineering, ISSN 0733-9445, E-ISSN 1943-541X, Vol. 144, no 10, article id 04018197Article in journal (Refereed)
    Abstract [en]

    OSB sheathing-to-wood framing connection, as typically used in light-frame shear walls, was experimentally examined in a novel biaxial test setup with respect to possible path dependence of the load-displacement relation. The connection with an annular-ringed shank nail was loaded under displacement control following nine different displacement paths within the sheathing plane, which coincided at a number of points. In intersection points, resultant connection force, its orientation and work performed on the connection system to reach the specific point were calculated and compared. Evaluation of experiments revealed significant path dependence with respect to orientation of force resultants at path intersection points. However, magnitude of the forces and the work carried out showed relatively small dependence of the displacement path undertaken. Comparison of uniaxial connection tests with the European yield model demonstrated strong contribution of withdrawal resistance of the ringed shank nail to its lateral strength. Results of this type are a valuable basis to build better models when simulating such connections in wood structures.

  • 38.
    Beijbom, Mattias
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bojcic, Dino
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Uppföljning av energikrav för passivhusvillor, Vikaholm2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppvärmning av bostäder och lokaler står för en stor del av energianvändningen i Sverige. Energieffektiva byggnader som exempelvis passivhus bidrar till att sänka energianvändningen. Det nya bostadsområdet Vikaholm i Växjö kommun strävar efter en långsiktig och hållbar utveckling, där byggandet av passivhus uppmuntras. För att säkerställa att passivhus byggts krävs en verifieringsmetod som garanterar att villkoren i kravspecifikationen FEBY12 följts. Syftet med denna studie är att föreslå en metod för verifiering av passivhus för Växjö kommun. Om metoden fungerar väl kan även andra kommuner nyttja metoden i framtiden.

  • 39.
    Bengtsdottir, Fanney
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Hagerup Norrman, Christel
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Att bygga energisnålt med olika ventilationssystem2018Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [en]

    A ventilation system in a building provides sufficient amount of fresh air and create a negative pressure to reduce moisture-related problems. Today several ventilation systems, some with different energy recovery, are available and those inherence different features and limitations. This study examines differences between exhaust air ventilation without heat recovery (F), exhaust air heat pump (FVP) and exhaust and supply air ventilation with a rotating heat exchanger (FTX) in nearly zero-energy houses. Three single-family houses in Kronoberg County were strategically chosen for the data collection, measurements, interviews and calculations to evaluate and compare their system’s performances in terms of thermal comfort, air circulation, heat recovery effects, energy use and financial attractiveness. The results show that the criteria for thermal comfort are satisfied and the specific energy consumption are within the current requirements in all these houses. Under the period of investigation, the house without heat recovery requires minimum quantity of electricity for ventilation system where as the house with FVP is the most energy efficient. Also, the house with an FVP shows to be the most cost-efficient with lowest accumulated costs. The results are limited for a specific outdoor climate during the studied period. Therefore, examinations over a longer term in different contexts are recommended for a more comprehensive view.

  • 40.
    Bengtsson, Charlotte
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Byggteknik.
    Serrano, Erik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Fonselius, Mikael
    Riipola, Kirsti
    Conformity assessment for machine graded timber by using output control2008Report (Other academic)
    Abstract [en]

    In the Nordic countries machine strength grading of structural timber is becoming increasingly important. A new standard, EN 14081, which allows CE-marking of strength graded structural timber was recently accepted. This standard allows both machine

    control and output control as methods for controlling the graded timber. Machine control is most commonly used in Europe. The project reported here deals with output control. This method is commonly used in for example USA.

    Theoretical studies carried out within this project show that applying output control gives higher yield, especially in high strength classes. A document describing the implementation of the output control procedure is written and given in Appendix 1 of this report.

  • 41.
    Bengtsson, Maja
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Stegljud i två moderna universitetsbyggnader med trästomme: en utvärdering av enkätundersökningar och mätningar2011Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This thesis deals with the impact sound of two wooden buildings on the campus site in Växjö. The city is highlighted frequently as a good model on environmental and climate issues. The municipal real estate company that owns, manages and builds the university's buildings, is interested in these issues when building new houses. The two most recently built houses are constructed with wooden frames, which is considered a good environmental choice. Future house is also expected to be built with wooden frames. Unfortunately problems due to acustics are often raised. One of the existing houses at the university are said to have problems with its impact sound and the property owner want this potential problem to be improved for future buildings. The purpose of this study is to gain knowledge from two existing wooden houses in the area. To do this a survey investigating how the acoustics of the buildings are perceived is compared with measurement of impact sound measurements.

  • 42.
    Berkowicz, Kasper
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Undersökning av byggprodukter och material för Svanenmärkt byggnad2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Svanen är Nordens officiella miljömärkningssystem, där många olika produkter kancertifieras. Detta arbete är en del av processen för byggföretaget GBJ Bygg att uppnåSvanenmärkning av ett av sina typhus. I arbetet utförs en energiberäkning på husetför att undersöka om huset klarar Svanens energikrav. Vidare undersöks en rad olikabyggprodukter och -material och jämförs mot Svanens krav. Syftet med arbetet är att skapa en lista med produkter och material som GBJ kan använda vid byggnation av ett Svanenmärkt hus, samt att ge förslag på eventuella ändringar som behöver göras för att huset ska klara Svanens energikrav. Energiberäkningen gjordes med hjälp av datorprogrammet VIP Energy, i samråd med en energisakkunnig ingenjör, medan undersökningen av produkterna främst gjordes via insamling av information från olika hemsidor och dokument hämtade fråninternet, samt kommunikation med tillverkarna. Resultaten visar att ändringar krävs för att huset skall uppfylla energikravet. Av 81 undersökta produkt anses 58 kunna godkännas för användning vid byggnation av en Svanenmärkt byggnad.

  • 43.
    Billgren, Annette
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Kvarteret Allön 4: Gammalt och nytt i en spännande kombination2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Kristianstads bakgator bestod fram till en bit in på 1900-talet av låg bebyggelse i ett och två plan. Idag finns endast fem bevarade envåningshus kvar inom stadskärnan. Ett av dessa hus har nu under en längre tid fått stå tomt och förfalla medan ett rivningshot inväntas.

    Diskussionerna om vad man ska göra med kvarteret har pågått i snart 20 år, utan att man lyckats nå någon lösning, situationen är minst sagt låst.

    Detta arbete lägger fram nya idéer och förslag på hur huset och kvarteret som det ligger i skulle kunna utvecklas, förslaget som ser till de olika parternas önskemål och som skulle kunna vara en lösning för både huset, staden och fastighetsägaren.

     

  • 44.
    Blomberg, Harriet
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Pettersson, Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Linnéuniversitetets järnvägsstation: Ett utformningsförslag2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studien i rapporten sammanställs i ett utformningsförslag till Linnéuniversitetets järnvägsstation.Stationen är dimensionerad efter 35 sittande, väntande resenärer. Materialen är till sörsta del träoch glas.Utformningen visualiceras med en modell i trä, 2d ritningar i cad och 3d modell i googlesketchup.Förslaget går i modernismens teorier med avskalad och geometrisk enkel arkitektur. Det har enöppen planlösning med många funktioner.

  • 45.
    Blomberg, Malin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Villans park - en plats för alla2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I Växjös centrala delar ligger Villans Park som är en plats som grundar sig på en historisk sträckning. Från Storgatan går den gamla gatusträckningen och bildar Villans Park med Askelyckans café placerat i mitten.

    Viker man av från Storgatan och fortsätter bakom Askelyckan upplevs området som en bakgård. Mindre attraktivt och gatan tar slut i ingenting.

    Villans Park är ett område med stora möjligheter att förändras och med ett fantastiskt läge. Här finns möjligheter att öka attraktiviteten genom att ta vara på platsbildningen, eventuellt öppna passagemöjligheter, hitta nya affärsytor, öppna upp ytor för uteserveringar eller för annan användning.

    En annan stads arbete med förändring av stadskärnan presenteras och en dialog har förts med fastighetsägarna i området, stadsbyggnadskontoret och tekniska kontoret, även platsens historia presenteras, Boverket och Växjö kommuns råd och riktlinjer kommer att undersökas.

    Resultatet redovisas med foton från miljöer i området i dagens skick och därtill skisser på det tänkta resultatet, bakgrundsfakta av området med en gammal karta, nuvarande kartbild som visar var platsen finns i Växjö och en plan över området med förändringar (visionsbild).

  • 46.
    Blomqvist, Lars
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Pfriem, Alexander
    Eberswalde University for Sustainable Development, Germany.
    Johansson, Jimmy
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Temporary buildings in reusable lightweight material design2016In: Proceedings of the 2016 World Conference on Timber Engineering (WCTE), Vienna, Austria: Vienna University of Technology , 2016Conference paper (Refereed)
    Abstract [en]

    There is a growing need and market for temporary buildings for various purposes, including largeconstruction projects in the tourism and events sectors or in civil protection. This paper gives an overview about the useof reusable lightweight materials in temporary buildings. Based on a project proposal submitted to the 7th framework, anew concept of temporary buildings is proposed. This concept combines the advantages of the premanufacturing of asmall number of parts and wooden components and a flexible and modular erection of the temporary building. Thefocus is on fast establishment with a maximum of three persons. A flexible and modular extension is possible.Assembling and disassembling the individual components with novel connect systems, adapted from the furnitureindustry, is proposed.This project aims to bring these concepts into new temporary buildings with new, reusable, and flexible lightweightdesign.

  • 47.
    Blyberg, Louise
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Olsson, Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Fire exposed light-frame timber walls: A study on the effect of geometrical reduction of a vertically loaded I-section stud2009Report (Other academic)
    Abstract [en]

    A wooden I-stud as a member of a light-frame timber wall is modelled with reducing flange width to simulate fire exposure. The stud is loaded with a vertical load and the effect of restraints from one gypsum board and the top and bottom rail is considered. Geometry and material values are chosen to correspond to a stud with flanges of solid wood and web of OSB (oriented strand board).

    A model with shell and beam elements is implemented in Abaqus. A buckling analysis is performed on a perfectly straight stud and then a geometrically nonlinear analysis is performed on a stud with an initial curvature. Both the buckling analysis and the geometrically nonlinear analysis show that even a large reduction of the flange width results only in moderate changes of the load-carrying capacity of the structure.

    In the report diagrams are presented from the geometrically nonlinear analysis where the critical load is easy to read once a failure stress is determined, but an estimate of the the failure stress is not given here.

  • 48.
    Blyberg, Louise
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Serrano, Erik
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Enquist, Bertil
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Sterley, Magdalena
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Adhesive joints for structural timber/glass applications: Experimental testing and evaluation methods2012In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 35, p. 76-87Article in journal (Refereed)
    Abstract [en]

    A study of three different adhesives, silicone, acrylate and polyurethane, intended for adhesive joints in structural timber/glass applications is presented in this paper. Intentionally, adhesives with a wide range of properties were chosen. The adhesive bonds between timber and glass were tested both in tension and in shear with a bond area of 800 mm2. Special fixtures were designed both for gluing and testing the specimens. The results include strength and failure type of the adhesive bond as well as deformation of the bond lines, measured with LVDTs and a non-contact optical 3D-deformation measuring system used in combination with finite element modelling in order to obtain detailed information about the behaviour.

    Of the tested adhesives, the acrylate (SikaFast 5215) provided the largest strength, both in tension and shear. The mean strength obtained for this adhesive bond was 3.0 MPa in tension and 4.5 MPa in shear.

    Further, it is demonstrated how rotations in the specimen during the test can be detected with the optical measuring system and how finite element modelling can be used to study the stress distribution internally in the adhesive bond. One conclusion obtained from the combination of results from the optical measuring system and finite element modelling is that the behaviour of the silicone adhesive is highly influenced by its near incompressible behaviour.

  • 49.
    Blyberg, Louise
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Serrano, Erik
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Enquist, Bertil
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Sterley, Magdalena
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Timber/Glass Adhesive Bonds: Experimental testing and evaluation methods2010Report (Other academic)
    Abstract [en]

    Both timber and glass are materials that have aesthetically pleasing properties. An appealing idea is to combine them to overcome the drawbacks and utilise the beneficial mechanical properties. Adhesive bonding with an appropriate adhesive could provide a uniform stress distribution at the transition between the materials.

    This report presents a study of three different adhesives, silicone, acrylate and polyurethane. Intentionally, adhesives with a wide range of properties were chosen. The adhesive bonds between timber and glass were tested both in tension and in shear with rather small bonds, 800 mm2. Special fixtures were designed both for gluing and testing of the adhesive bond specimens studied. The results presented include a traditional study of strength, failure type and relative displacement measured with LVDT’s, but also an extended study with a non-contact optical 3D-deformation measuring system and finite element modelling.

    Of the adhesives tested, the acrylate (SikaFast 5215) performed best, both in tension and shear. The mean strength obtained for this adhesive was 3.0 MPa in tension and 4.5 MPa in shear. Even if an important factor when gluing glass is the load distribution ability, the flexible silicone adhesive has too low stiffness and strength for use in structural components, where structural refers to the ability of a component to carry loads other than its own weight.

  • 50.
    Bodelsson, Cecilia
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sandersson, Emma
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Kompaktaggregat till Passivhus i Sverige2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Compact units are an integrated balanced ventilation whit recovery and an extracted air heat

    pump that are used in passive houses. We have done some energy calculations to see how

    compact units would be able to operate in Sweden.

    The results we have been receiving from VIP+, display that a passive house with an installed

    compact unit manages to achieve the demands for passive houses all the way up to the city

    Skellefteå. The calculated values are below the demands for passive house, but a certain margin

    is needed for the demands to be met after the building is complete. We have also construed

    technical data in a way that can have a positive effect on the passive houses in colder locations.

    Because of this we do not think the values for the three cities furthest north are entirely reliable.

    The other locations look good. Passive houses with an installed compact unit would, according

    to our research meet the passive house demands in these cities; Malmö, Växjö, Göteborg,

    Stockholm and with a doubt Borlänge.

1234567 1 - 50 of 450
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