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  • 1.
    Ormarsson, Sigurdur
    et al.
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Vessby, Johan
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Källsner, Bo
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Filchev, Ivan
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Numerical analysis of failure modes and force distribution in a pitched roof structure of wood2016In: 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 (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.

  • 2.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Enquist, Bertil
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Källsner, Bo
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Directional dependency in an OSB sheathing-to-framing mechanical connection2014Conference paper (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.

  • 3.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Källsner, Bo
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Girhammar, Ulf Arne
    Umeå universitet, Institutionen för tillämpad fysik och elektronik.
    Influence of contact stress between sheets on strength and stiffness of timber frame shear walls2010In: Proceedings of the 11th World Conference on Timber Engineering / [ed] Ario Ceccotti, 2010Conference paper (Refereed)
  • 4.
    Vessby, Johan
    et al.
    Växjö universitet, Institutionen för teknik och design.
    Källsner, Bo
    Växjö universitet, Institutionen för teknik och design.
    Olsson, Anders
    Växjö universitet, Institutionen för teknik och design.
    Influence of initial gap between timber members on stiffness and capacity of shear walls2008In: 10:th World Conference on Timber Engineering, 2008Conference paper (Refereed)
  • 5.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Källsner, Bo
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Olsson, Anders
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Girhammar, Ulf Arne
    Luleå Univ Technol.
    Evaluation of softening behaviour of timber light-frame walls subjected to in-plane forces using simple FE models2014In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 81, p. 464-479Article in journal (Refereed)
    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.

  • 6.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Källsner, Bo
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Ormarsson, Sigurdur
    Linnéuniversitetet, Institutionen för byggteknik (BY).
    Stabilisering av takkonstruktioner i trä: arbetet med ny handbok2016In: Bygg & teknik, ISSN 0281-658X, no 4, p. 60-63Article in journal (Other (popular science, discussion, etc.))
  • 7.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Serrano, Erik
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Olsson, Anders
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Girhammar, Ulf Arne
    Luleå University of Technology.
    Källsner, Bo
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Simulation of bottom rail fracture in partially anchored shear walls using XFEM2012In: 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 (Refereed)
1 - 7 of 7
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