lnu.sePublications
1 of 1
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Parametric FE-modelling of non-linear racking behaviour of light-frame shear walls and modules used for multi-storey timber buildings
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0001-5595-7617
2024 (English)Doctoral thesis, comprehensive summary (Other academic)Alternative title
Parametrisk FE-modellering av olinjärt skjuvbeteende hos skiv-regelväggar och moduler för flervåningsbyggande i trä (Swedish)
Abstract [en]

Wood is a sustainable material from nature that has a longstanding traditionas a building material. Compared to other construction materials, such as steeland concrete, the significance of using structural timber and engineered wood products has increased in recent years because they are regarded as a renewable source and require a low carbon footprint and less energy consumption during production. In Scandinavia, the European design standard EN 1995-1-1 (EC5) is extensively used to guide structural engineers in the design of timber structures, while addressing safety and service ability issues. However, this standard relieson multiple simplifications to achieve simple semi empirical hand calculations. In addition to these simplified expressions, engineers and researchers need reliable numerical models to study the racking behaviour of light-frame timber structures with arbitrary geometry under complex loading conditions. Such modelling tools must be computationally effective, easy to use and able to simulate the global structural behaviour as well as the local fastener force distributions and the crack growth in the sheathing panels.The main aim of this doctoral thesis is to develop a numerical model to analyse the complex structural behaviour of prefabricated light-frame timber modules. The model is developed in the commercial finite element software ABAQUS® with the assistance of the parametric Python scripting method. This thesis work also includes development of a graphical user interface in Python for user-friendly inputs, outputs, and visualisation of the numerical results. The simulation tool was used to study two different structural applications, firstly light-frame timber walls and then light-frame timber modules. For these applications, the modelling of the mechanical sheathing-to-framing joints is very important. In the first paper application, oriented and uncoupled elastic spring-based connectors were used to simulate the sheathing-to-framing joints. To define the material parameters for the connector, new Eurocode-based expressions were also presented. To simulate the permanent displacements in the sheathing-to-framing joints a coupled elasto-plastic spring-based connector model was proposed in papers II and III for both isotropic and orthotropic joint properties.To validate the accuracy of the numerical model, full-scale experimental tests were conducted for light-frame timber walls and modules. The validation indicates that by using effective 3D structural elements, the model achieves a satisfying balance between computational efficiency and reasonable accuracy. The numerical results presented for the applications agreed well with experimental results, regarding the global and local displacements and crack growth in the sheathing panels. The simulation results also increased the understanding of local joint behaviour in terms of fastener forces and their directions. The developed model was used to perform numerous parametric studies and thus investigate how different geometries, sheathing panels, connection types orboundary conditions affect the global and local structural behaviour of light-frame timber structures. These studies demonstrate how the parametric modelling can easily be used to analyse how different parameters have influence on these types of structures and significantly reduce the number of experimental tests necessaryto perform.The parametric model has also the potential to be further developed for the structural design of more complex modular-based multi-storey timber buildings. Furthermore, the proposed orthotropic elasto-plastic spring-based connector model can be further calibrated to simulate the performance of dowel-type connections in wood-based materials. 

Place, publisher, year, edition, pages
Linnaeus University Press, 2024. , p. 75
Series
Linnaeus University Dissertations ; 521
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-128262DOI: 10.15626/LUD.521.2024ISBN: 9789180821438 (print)ISBN: 9789180821445 (electronic)OAI: oai:DiVA.org:lnu-128262DiVA, id: diva2:1844408
Public defence
2024-04-19, N1017, hus N, Växjö, 09:00 (English)
Opponent
Supervisors
Available from: 2024-03-15 Created: 2024-03-13 Last updated: 2024-04-08Bibliographically approved
List of papers
1. A numerical and experimental investigation of non-linear deformation behaviours in light-frame timber walls
Open this publication in new window or tab >>A numerical and experimental investigation of non-linear deformation behaviours in light-frame timber walls
2022 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 252, article id 113599Article in journal (Refereed) Published
Abstract [en]

In recent decades, there is a trend in Scandinavian countries to build multi-storey residential houses using prefabricated timber modules. It is a highly efficient construction process with less environmental impact and less material waste. A significant building element in the timber modules is the light-frame timber wall, which has to be carefully analysed and optimized in this process. This paper presents a new parametric Finite Element (FE) model that can simulate both in-plane and out-of-plane deformations in the light-frame walls. A new and flexible (Eurocode based) approach to define the properties of the mechanical connections is introduced. A numerical model is presented through simulations of several walls that were verified with full-scale experiments. The results indicate that the numerical model could achieve fairly reasonable accuracy with the new approach. Furthermore, several parametric studies are presented and discussed from global and local points of view, to investigate the effects of certain parameters that are not considered in the design method according to Eurocode 5.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Timber structures, Internal force distribution, Light-frame shear walls, Parametric studies, Openings
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-111229 (URN)10.1016/j.engstruct.2021.113599 (DOI)000772614300002 ()2-s2.0-85120753014 (Scopus ID)2021 (Local ID)2021 (Archive number)2021 (OAI)
Available from: 2022-04-08 Created: 2022-04-08 Last updated: 2024-03-13Bibliographically approved
2. Nonlinear FE-analysis and testing of light-frame timber shear walls subjected to cyclic loading
Open this publication in new window or tab >>Nonlinear FE-analysis and testing of light-frame timber shear walls subjected to cyclic loading
2023 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 362, article id 129646Article in journal (Refereed) Published
Abstract [en]

Light-frame timber shear walls have been used as load-bearing elements in buildings for several decades. To predict the performance of such structural elements under loading, numerous analytical and numerical models have been developed. However, little focus has been on the prediction of the plastic damage behaviour and unloading of the walls. In this paper, a parametric Finite Element (FE) model is further developed by introducing elasto-plastic connectors to simulate the mechanical behaviour of the sheathing-to-framing connections. To verify the accuracy of the elasto-plastic model, full-size walls were tested and compared with results from simulations. The numerical results, from a few loading cycles, indicate that the model achieves reasonable accuracy in predicting both the nonlinear elastic and plastic deformations. Both experimental and simulation results demonstrate the importance of opening locations relating to the external racking force. The results also indicate that for a double-layer wall, its racking strength can be achieved by summation of the separate contribution from each layer. Furthermore, the internal layer was observed to contribute significantly less than the external layer since its nail pattern was based on the sheathing pattern of the external layer.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Timber structures, FE-modelling, Light-frame shear walls, Numerical model, Elasto-plastic connectors
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-118156 (URN)10.1016/j.conbuildmat.2022.129646 (DOI)000897057100003 ()2-s2.0-85141920114 (Scopus ID)
Available from: 2023-01-05 Created: 2023-01-05 Last updated: 2024-03-13Bibliographically approved
3. Numerical and experimental investigations of cracked light-frame timber walls
Open this publication in new window or tab >>Numerical and experimental investigations of cracked light-frame timber walls
(English)Manuscript (preprint) (Other academic)
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-128261 (URN)
Available from: 2024-03-13 Created: 2024-03-13 Last updated: 2024-03-15
4. Numerical and experimental investigations of prefabricated light-frame timber modules
Open this publication in new window or tab >>Numerical and experimental investigations of prefabricated light-frame timber modules
2024 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 303, article id 117528Article in journal (Refereed) Published
Abstract [en]

Structures built with prefabricated timber modules have been recognised as an innovative construction method and have been implemented in several countries and regions. In recent years, there have been considerable research activities directed towards these types of structures. However, most of the studies have focused on modules made of steel and concrete in their load-bearing structures and only a few of them are exploring light-frame timber modules. This study focuses on the racking behaviour of light-frame timber modules through experimental and numerical investigations. Full-size tests were performed to examine the global and local structural behaviours of several test modules. A novel finite element model of the modules is also presented. It is a parameterised structural model with high flexibility concerning the generation of different module geometries, materials, fastener types and assembly methods etc. The numerical model was developed in the commercial finite element software ABAQUS, and the numerical results obtained were validated against results from experimental tests. The validation results indicate that the model is capable of achieving satisfactory accuracy in predicting both the global and local structural behaviour of light-frame timber modules. Furthermore, several parametric studies are conducted and discussed to examine how certain parameters affect the structural response of the modules.

Place, publisher, year, edition, pages
Elsevier, 2024
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-128260 (URN)10.1016/j.engstruct.2024.117528 (DOI)2-s2.0-85184167712 (Scopus ID)
Available from: 2024-03-13 Created: 2024-03-13 Last updated: 2024-03-15Bibliographically approved

Open Access in DiVA

Comprehensive summary(45692 kB)36 downloads
File information
File name FULLTEXT01.pdfFile size 45692 kBChecksum SHA-512
045a9557caeda98f53123c248716fdd94e1de07b151a810b796e55f802e50189880b8e065cc790018ba2a7932fb874eada3d35b3bc7096fb4d2c3ce0a2f0d937
Type fulltextMimetype application/pdf

Other links

Publisher's full textBuy Book (SEK 250 + VAT and postage) lnupress@lnu.se

Authority records

Kuai, Le

Search in DiVA

By author/editor
Kuai, Le
By organisation
Department of Building Technology
Building Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 36 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 835 hits
1 of 1
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf