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Cyclic behavior of cross-laminated timber (CLT) wall systems: Experimental tests and analytical prediction models
No full textAn experimental program was performed at IVALSA Trees and Timber Institute on single and coupled cross-laminated (CLT) wall panels with different anchoring systems and different types of joints between adjacent panels. The mechanical properties of CLT walls were assessed and are critically discussed in the paper. The connector layout and the design of the screwed vertical joints were found to markedly affect the overall behavior of the structural system. The in-plane deformations of CLT panels were almost negligible, whereas concentration
of forces and deformations mainly occurred in the connections. Advanced analytical models for nonlinear pushover analysis of CLT wall systems were developed and verified against test results. The models take into account all stiffness and strength components of connectors, as
well as the bending and shear deformation of the panels. A parametric study of CLT wall systems with different aspect ratios and wall segmentation was performed, showing that segmentation of CLT walls decreases their stiffness and strength but significantly improves their deformation capacity
"Strength and deformation characteristics of typical X-lam connections"
No full textThis paper presents some of the results of an extensive experimental programme on typical X-Lam connections, conducted at CNR-IVALSA research institute. The goal of this research is to provide a better understanding of the seismic performance of connections in cross-laminated timber buildings subjected to seismic
actions. In-plane monotonic and cyclic shear tests were performed on mechanical screwed connections between
adjacent parallel wall-wall and floor-floor X-Lam panels. In addition, monotonic and cyclic tests were carried out on orthogonally connected panels (wall-wall and wall-floor) subjected to shear and withdrawal load. Mechanical properties in terms of strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The
overstrength factor, which is of great importance in capacity-based design, was also evaluated for the different types of connection tested
"Strength and deformation characteristics of typical X-lam connections"
No full textThis paper presents some of the results of an extensive experimental programme on typical X-Lam connections, conducted at CNR-IVALSA research institute. The goal of this research is to provide a better understanding of the seismic performance of connections in cross-laminated timber buildings subjected to seismic
actions. In-plane monotonic and cyclic shear tests were performed on mechanical screwed connections between
adjacent parallel wall-wall and floor-floor X-Lam panels. In addition, monotonic and cyclic tests were carried out on orthogonally connected panels (wall-wall and wall-floor) subjected to shear and withdrawal load. Mechanical properties in terms of strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The
overstrength factor, which is of great importance in capacity-based design, was also evaluated for the different types of connection tested
“Experimental cyclic tests on cross-laminated timber panels and typical connections.”
No full textCross-laminated timber panels (X-LAM) are used more and more as construction material for buildings. Since such panels are fairly stiff in their plane, particularly when obtained by gluing adjacent layers of planks, they cannot dissipate significant amount of energy during an earthquake. The mechanical connections between adjacent panels and with the foundations hence become the most important component affecting the static and cyclic behaviour of X-LAM buildings. For a reliable seismic analysis, therefore, it is crucial to investigate the cyclic behaviour of the connections between wall panels.
An extended experimental programme on typical X-LAM connections was performed at IVALSA Trees and Timber Institute. Shear and pull-out monotonic and cyclic tests were carried out on holddowns and steel angle connectors used to anchor the wall panels. In-plane shear tests were also performed on mechanical screwed connections between adjacent X-LAM panels. In addition, cyclic tests were carried out on full-scale single and coupled cross-lam wall panels with different configurations and mechanical connectors subjected to lateral force.
The paper discusses the results of these tests in terms of strength, stiffness, energy dissipation, impairment of strength and ductility. A comparison between test results and a simplified analytical calculation method is also provided. The overstrength factor, which is of great importance in capacity based design, was also evaluated for the different types of connection tested
“Experimental cyclic tests on cross-laminated timber panels and typical connections.”
No full textCross-laminated timber panels (X-LAM) are used more and more as construction material for buildings. Since such panels are fairly stiff in their plane, particularly when obtained by gluing adjacent layers of planks, they cannot dissipate significant amount of energy during an earthquake. The mechanical connections between adjacent panels and with the foundations hence become the most important component affecting the static and cyclic behaviour of X-LAM buildings. For a reliable seismic analysis, therefore, it is crucial to investigate the cyclic behaviour of the connections between wall panels.
An extended experimental programme on typical X-LAM connections was performed at IVALSA Trees and Timber Institute. Shear and pull-out monotonic and cyclic tests were carried out on holddowns and steel angle connectors used to anchor the wall panels. In-plane shear tests were also performed on mechanical screwed connections between adjacent X-LAM panels. In addition, cyclic tests were carried out on full-scale single and coupled cross-lam wall panels with different configurations and mechanical connectors subjected to lateral force.
The paper discusses the results of these tests in terms of strength, stiffness, energy dissipation, impairment of strength and ductility. A comparison between test results and a simplified analytical calculation method is also provided. The overstrength factor, which is of great importance in capacity based design, was also evaluated for the different types of connection tested
“Capacity seismic design of X-LAM wall systems based on connection mechanical properties.”
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