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Publications (7 of 7) Show all publications
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
Serrano, E., Vessby, J. & Olsson, A. (2012). Modeling of fracture in the sill plate in partially anchored shear walls. Journal of Structural Engineering, 138(10), 1285-1288
Open this publication in new window or tab >>Modeling of fracture in the sill plate in partially anchored shear walls
2012 (English)In: Journal of Structural Engineering, ISSN 0733-9445, E-ISSN 1943-541X, Vol. 138, no 10, p. 1285-1288Article in journal (Refereed) Published
Abstract [en]

This study relates to the topic of anchorage of shear walls. At times, eccentric forces between the sheathing and the anchoring devices may be introduced in the sill plate. In severe cases, such forces may cause the sill plate to split and to fail in a brittle manner. In this study, fracture mechanics are applied to develop a simple closed-form hand-calculation expression for estimation of the ultimate load capacity of the sill plate. Finite-element analyses using both linear elastic fracture mechanics (LEFM) theory and a nonlinear fictitious crack model are also used to predict the ultimate load-bearing capacity of the sill plate. The hand-calculation model is compared with the finite-element models, and good agreement is obtained. The results obtained with the various fracture mechanics models are compared with results available from previously performed experimental tests, and again good agreement is obtained. A general conclusion is that the LEFM theory is an adequate approach for the case studied and that the hand-calculation expression developed could be useful for structural design.

Place, publisher, year, edition, pages
Reston, VA: American Society of Civil Engineers (ASCE), 2012
Keywords
timber construction, cracking, shear walls, anchorage, finite element method, plates
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74391 (URN)10.1061/(ASCE)ST.1943-541X.0000548 (DOI)2-s2.0-84873381940 (Scopus ID)
Available from: 2012-11-07 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., Serrano, E. & Olsson, A. (2010). Coupled and uncoupled nonlinear elastic finite element models formonotonically loaded sheathing-to-framing joints in timber based shear walls. Engineering structures, 32(11), 3433-3442
Open this publication in new window or tab >>Coupled and uncoupled nonlinear elastic finite element models formonotonically loaded sheathing-to-framing joints in timber based shear walls
2010 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 32, no 11, p. 3433-3442Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2010
Keywords
Shear walls, Coupled model, Sheathing-to-framing joint, Finite element method
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74404 (URN)10.1016/j.engstruct.2010.05.018 (DOI)2-s2.0-77957304222 (Scopus ID)
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-21Bibliographically approved
Vessby, J., Olsson, A. & Enquist, B. (2008). Contact-free strain measurement of bi-axially loaded sheathing-to-framing connection. In: 10:th World Conference on Timber Engineering: .
Open this publication in new window or tab >>Contact-free strain measurement of bi-axially loaded sheathing-to-framing connection
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-74402 (URN)
Available from: 2008-11-11 Created: 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
Vessby, J. & Olsson, A. (2006). Stabilizing strategies for multi-story timber frame structures. In: 9th World Conference on Timber Engineering: . Oregon State University, Portland, OR 97331, U.S.A 2006
Open this publication in new window or tab >>Stabilizing strategies for multi-story timber frame structures
2006 (English)In: 9th World Conference on Timber Engineering, Oregon State University, Portland, OR 97331, U.S.A 2006 , 2006Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Oregon State University, Portland, OR 97331, U.S.A 2006, 2006
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74401 (URN)
Available from: 2007-05-11 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-6410-1017

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