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Källsner, Bo
Publications (7 of 7) Show all publications
Ormarsson, S., Vessby, J., Källsner, B. & Filchev, I. (2016). Numerical analysis of failure modes and force distribution in a pitched roof structure of wood. In: J. Eberhardsteiner, W. Winter, A. Fadai, M. Pöll (Ed.), Proceedings of the 2016 World Conference on Timber Engineering (WCTE): . Paper presented at WCTE 2016 World Conference on Timber Engineering, August 22-25, 2016, Vienna, Austria. Vienna: Vienna University of Technology
Open this publication in new window or tab >>Numerical analysis of failure modes and force distribution in a pitched roof structure of wood
2016 (English)In: Proceedings of the 2016 World Conference on Timber Engineering (WCTE) / [ed] J. Eberhardsteiner, W. Winter, A. Fadai, M. Pöll, Vienna: Vienna University of Technology , 2016Conference paper, Published paper (Refereed)
Abstract [en]

Instability failures of timber elements and timber structures are reported relatively frequently although there are some suggestions available how to prevent such failures. These types of failures are characterized by sudden deformations that typically lead to failure in a single loadbearing element or collapse of the entire structure. This paper deals with buckling analysis and geometric nonlinear stress analysis of pitched roof structures of wood. A FE- model has been developed and used to study how different parameters influence the buckling modes and force distribution in the lateral bracing system of the roof structure. The simulated forces in the bracing system are also compared with results based on a simple design method given in Eurocode 5 (EC5) and a method where the compressed top chord is treated as a beam on a continuous elastic foundation. The buckling simulations showed the out-of-plane buckling to be the critical failure mode for the truss structure studied and the geometric nonlinear analysis showed the bracing stiffness and the bracing forces to be significant lower than those calculated by hand according to EC5.

Place, publisher, year, edition, pages
Vienna: Vienna University of Technology, 2016
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74382 (URN)2-s2.0-85010932009 (Scopus ID)978-3-903039-00-1 (ISBN)
Conference
WCTE 2016 World Conference on Timber Engineering, August 22-25, 2016, Vienna, Austria
Available from: 2017-10-05 Created: 2019-08-28Bibliographically approved
Vessby, J., Källsner, B. & Ormarsson, S. (2016). Stabilisering av takkonstruktioner i trä: arbetet med ny handbok. Bygg & teknik (4), 60-63
Open this publication in new window or tab >>Stabilisering av takkonstruktioner i trä: arbetet med ny handbok
2016 (Swedish)In: Bygg & teknik, ISSN 0281-658X, no 4, p. 60-63Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Foerlags AB Bygg & Teknik, 2016
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74400 (URN)
Available from: 2017-10-05 Created: 2019-08-16Bibliographically approved
Vessby, J., Enquist, B. & Källsner, B. (2014). Directional dependency in an OSB sheathing-to-framing mechanical connection. In: : . Paper presented at WCTE, World Conference on Timber Engineering, Quebec City, 10-14 August.
Open this publication in new window or tab >>Directional dependency in an OSB sheathing-to-framing mechanical connection
2014 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Nailed connections are commonly employed for connecting sheathings to the framing used in shear walls. Although many aspects of such connections have been investigated thoroughly within the research community generally, the effect the loading direction has on connections of this sort has been much less investigated. In the present study experimental tests were carried out for determining in detail the effects the loading has on different sheathing-to-framing connections. The results obtained indicated the degree of loading to which a nail fastened to an oriented strand board (OSB) sheathing is subjected to not be strongly affected by which of the two main loading directions is involved, but that the effects of loading direction are found to be much greater if the timber element in question is also included in the testing carried out. The dependency of the loading effect on the loading direction at different loading stages and for different directions - parallel to the fibres, perpendicular to them, at some angle between these two main directions - was investigated here.

National Category
Building Technologies
Identifiers
urn:nbn:se:kau:diva-74395 (URN)2-s2.0-84925014934 (Scopus ID)
Conference
WCTE, World Conference on Timber Engineering, Quebec City, 10-14 August
Available from: 2014-05-28 Created: 2019-08-16Bibliographically approved
Vessby, J., Källsner, B., Olsson, A. & Girhammar, U. A. (2014). Evaluation of softening behaviour of timber light-frame walls subjected to in-plane forces using simple FE models. Engineering structures, 81, 464-479
Open this publication in new window or tab >>Evaluation of softening behaviour of timber light-frame walls subjected to in-plane forces using simple FE models
2014 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 81, p. 464-479Article in journal (Refereed) Published
Abstract [en]

The present investigation focuses on evaluating the entire load displacement relationship, especially the softening part, of light-frame wall segments subjected to in-plane monotonic forces when the load-slip curves of the individual sheathing-to-framing fasteners are considered. Different sheathing-to-framing joint characteristics, including unloading behaviour, and stud-to-rail joint characteristics are incorporated in the analyses. Two loading cases are investigated: Horizontal loading resulting in uplift of the leading stud and diagonal loading representing a fully anchored wall. Two common types of finite element (FE) models for the sheathing-to-framing joints are used for the analyses: A single spring model and a spring pair model, where the joint characteristics valid for the timber properties perpendicular and parallel to the grain are used. The maximum capacity of the wall segments is somewhat overestimated when using the spring pair model compared to that of the single spring model. The softening parts of the load displacement curves are significantly affected, regardless of whether the perpendicular or parallel characteristics of the joints are used. The results from FE simulations using models with perpendicular and parallel characteristics are compared with full scale test results for walls with a single segment loaded horizontally and diagonally. The behaviour of the wall segments subjected to horizontal loading is dominated by fastener displacements perpendicular to the bottom rail. Hence, FE models including perpendicular characteristics should be used. For diagonal loading the behaviour of the wall segments is dominated by displacements parallel to the framing members, and FE models including parallel characteristics should therefore be used. The analyses were extended to multiple segment walls resulting in the same type of behaviour as single segment walls. (C) 2014 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Light-frame wall, Stabilisation, FEM, Timber, Sheathing-to-framing joints, Stud-to-rail joints
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74399 (URN)10.1016/j.engstruct.2014.09.032 (DOI)000347494000039 ()2-s2.0-84955270937 (Scopus ID)
Available from: 2015-02-10 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
Vessby, J., Serrano, E., Olsson, A., Girhammar, U. A. & Källsner, B. (2012). Simulation of bottom rail fracture in partially anchored shear walls using XFEM. In: INTERNATIONAL COUNCIL FOR RESEARCH AND INNOVATIONIN BUILDING AND CONSTRUCTION, WORKING COMMISSION W18 - TIMBER STRUCTURES (CIB-W18): Meeting forty-five, Växjö, Sweden, August 2012. Paper presented at CIB-W18.
Open this publication in new window or tab >>Simulation of bottom rail fracture in partially anchored shear walls using XFEM
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2012 (English)In: INTERNATIONAL COUNCIL FOR RESEARCH AND INNOVATIONIN BUILDING AND CONSTRUCTION, WORKING COMMISSION W18 - TIMBER STRUCTURES (CIB-W18): Meeting forty-five, Växjö, Sweden, August 2012, 2012Conference paper, Published paper (Refereed)
Keywords
fracture, shear wall, bottom rail, XFEM
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74405 (URN)
Conference
CIB-W18
Available from: 2014-03-31 Created: 2019-08-16Bibliographically approved
Vessby, J., Källsner, B. & Girhammar, U. A. (2010). Influence of contact stress between sheets on strength and stiffness of timber frame shear walls. In: Ario Ceccotti (Ed.), Proceedings of the 11th World Conference on Timber Engineering: . Paper presented at WCTE 2010.
Open this publication in new window or tab >>Influence of contact stress between sheets on strength and stiffness of timber frame shear walls
2010 (English)In: Proceedings of the 11th World Conference on Timber Engineering / [ed] Ario Ceccotti, 2010Conference paper, Published paper (Refereed)
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74397 (URN)
Conference
WCTE 2010
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
Vessby, J., Källsner, B. & Olsson, A. (2008). Influence of initial gap between timber members on stiffness and capacity of shear walls. In: 10:th World Conference on Timber Engineering: .
Open this publication in new window or tab >>Influence of initial gap between timber members on stiffness and capacity of shear walls
2008 (English)In: 10:th World Conference on Timber Engineering, 2008Conference paper, Published paper (Refereed)
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74398 (URN)
Available from: 2008-11-11 Created: 2019-08-16Bibliographically approved
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