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Racking performance of Platform timber framed walls assessed by rigid body relaxation technique

D’Amico, B. / Kermani, A. / Porteous, J. / Dhonju, R. / Zhang, B.

Highlights • An iterative method to trace the racking load–displacement curve of timber framed walls. • The method is based on the assumption of rigid-body behaviour for the timber members and sheathings. • Only two DoFs are needed to model the kinematics of the timber frame. • The numerical model is validated against laboratory test results.

Abstract A new method to assess the raking performance of Platform timber framed walls, is provided in this study: each component of the unit wall assembly is assumed as rigid, hence allowing to drastically reduce the overall number of DoFs involved within the model. The timber frame in particular, is modelled as a mechanism, having only two DoFs (regardless of the number of studs) corresponding to the horizontal and rotational displacements of the header beam. For a given imposed horizontal displacement $Δ_{h}$ , the corresponding racking load $P (Δ_{h})$ is computed by numerical relaxation, allowing to consider a continuous function to represent the load-slip curves of the connections. A comparison of the numerical analysis against laboratory test results is provided, showing the method’s capability in predicting the raking strength of the wall, despite the assumed reduced number of DoFs.

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Racking performance of Platform timber framed walls assessed by rigid body relaxation technique

D’Amico, B. / Kermani, A. / Porteous, J. / Dhonju, R. / Zhang, B.

Highlights • An iterative method to trace the racking load–displacement curve of timber framed walls. • The method is based on the assumption of rigid-body behaviour for the timber members and sheathings. • Only two DoFs are needed to model the kinematics of the timber frame. • The numerical model is validated against laboratory test results.

Abstract A new method to assess the raking performance of Platform timber framed walls, is provided in this study: each component of the unit wall assembly is assumed as rigid, hence allowing to drastically reduce the overall number of DoFs involved within the model. The timber frame in particular, is modelled as a mechanism, having only two DoFs (regardless of the number of studs) corresponding to the horizontal and rotational displacements of the header beam. For a given imposed horizontal displacement $Δ_{h}$ , the corresponding racking load $P (Δ_{h})$ is computed by numerical relaxation, allowing to consider a continuous function to represent the load-slip curves of the connections. A comparison of the numerical analysis against laboratory test results is provided, showing the method’s capability in predicting the raking strength of the wall, despite the assumed reduced number of DoFs.

Racking performance of Platform timber framed walls assessed by rigid body relaxation technique

D’Amico, B. / Kermani, A. / Porteous, J. / Dhonju, R. / Zhang, B.

Highlights • An iterative method to trace the racking load–displacement curve of timber framed walls. • The method is based on the assumption of rigid-body behaviour for the timber members and sheathings. • Only two DoFs are needed to model the kinematics of the timber frame. • The numerical model is validated against laboratory test results.

Abstract A new method to assess the raking performance of Platform timber framed walls, is provided in this study: each component of the unit wall assembly is assumed as rigid, hence allowing to drastically reduce the overall number of DoFs involved within the model. The timber frame in particular, is modelled as a mechanism, having only two DoFs (regardless of the number of studs) corresponding to the horizontal and rotational displacements of the header beam. For a given imposed horizontal displacement $Δ_{h}$ , the corresponding racking load $P (Δ_{h})$ is computed by numerical relaxation, allowing to consider a continuous function to represent the load-slip curves of the connections. A comparison of the numerical analysis against laboratory test results is provided, showing the method’s capability in predicting the raking strength of the wall, despite the assumed reduced number of DoFs.

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Titel:

Racking performance of Platform timber framed walls assessed by rigid body relaxation technique

Beteiligte:

D’Amico, B. (Autor:in) / Kermani, A. (Autor:in) / Porteous, J. (Autor:in) / Dhonju, R. (Autor:in) / Zhang, B. (Autor:in)

Erschienen in:

Construction and Building Materials ; 129 ; 148-158

Erscheinungsdatum:

25.10.2016

Format / Umfang:

11 pages

ISSN:

DOI:

https://doi.org/10.1016/j.conbuildmat.2016.10.106

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

Platform framing , Timber framed walls , Raking performance , Dynamic relaxation , Non-linear analysis

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