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  • 1.
    Sejkot, Petr
    et al.
    Linnaeus Univ, PG Vejdes Vag, S-35195 Vaxjo, Sweden.;Klokner Inst, Solinova 7, Prague 16608, Czech Republic..
    Ormarsson, Sigurdur
    Linnaeus Univ, PG Vejdes Vag, S-35195 Vaxjo, Sweden..
    Vessby, Johan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Kallsner, Bo
    Linnaeus Univ, PG Vejdes Vag, S-35195 Vaxjo, Sweden..
    Numerical out-of-plane stability analysis of long span timber trusses with focus on buckling length calculations2020In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 204, article id 109670Article in journal (Refereed)
    Abstract [en]

    According to the harmonized European design code for timber structures, Eurocode 5, all pitched timber trusses are designed as an in-plane structure, meaning that the bracing systems used are assumed to prevent the out-of-plane failure of the truss if sufficient strength and stiffness are provided. The present paper studies how the stiffness of a wooden bracing system contributes to the out-of-plane stability of a trussed roof structure. Results from numerical simulations indicate that significant bracing forces may occur in compressed structural members for long-span timber structures. As well, the values obtained from the calculations according to Eurocode 5 are occasionally far from the results obtained by numerical simulations.

  • 2.
    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.

  • 3.
    Vessby, Johan
    et al.
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Serrano, Erik
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Olsson, Anders
    Linnéuniversitetet, Institutionen för teknik, TEK.
    Coupled and uncoupled nonlinear elastic finite element models formonotonically loaded sheathing-to-framing joints in timber based shear walls2010In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 32, no 11, p. 3433-3442Article in journal (Refereed)
    Abstract [en]

    Four different elastic models for sheathing-to-framing connections are presented and evaluated on asingle connection level and on a shear wall level. Since the models are elastic in their nature they aresuitable mainly for cases where the sheathing-to-framing connections are subjected to monotonicallyincreasing displacements. Of the four models one is uncoupled and the others are coupled with respect tothe two perpendicular displacement directions in a two-dimensional model. Two of the coupled modelsare non-conservative, while the third is conservative, indicating a path independency with respect to thework done to reach a defined state of deformation. When the different models are compared it is obviousthat the uncoupled model gives strength and stiffness values higher than the others; however it is notobvious which of the models to use in a shear wall analysis, each of the models having its advantages anddisadvantages. For the experimental data used as input in the analyses of this study however, a couplednon-conservative model seems the most appropriate.

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