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原文传递 In-Plane Shear Cyclic Performance of Spline Cross-Laminated Timber-Concrete Composite Diaphragms

题名：	In-Plane Shear Cyclic Performance of Spline Cross-Laminated Timber-Concrete Composite Diaphragms
正文语种：	eng
作者：	Taylor, Bradly;Barbosa, Andre R.;Sinha, Arijit
作者单位：	Oregon State Univ Sch Civil & Construct Engin Corvallis OR 97331 USA;Oregon State Univ Sch Civil & Construct Engin Corvallis OR 97331 USA;Oregon State Univ Dept Wood Sci & Engn Corvallis OR 97331 USA
关键词：	Diaphragm connections;In-plane shear;Mass timber;Single surface spline;Timber-concrete composite;Screw orientation
摘要：	Over the past decade, cross-laminated timber (CLT) panels have gained popularity worldwide. To achieve larger spans and to increase the resistance to diaphragm seismic and wind forces to be transferred through CLT floor or roof systems, CLT-concrete composite (CCC) floors have been developed as an alternative. While significant testing has been performed under gravity loading, limited experimental data exist on the in-plane performance of CCC systems. This study presents results from an experimental program designed to characterize the in-plane shear behavior of CCC diaphragm connections using different CLT to concrete screw connector orientations in a test setup that simulates the expected seismic load path in diaphragms for platform-type construction. Tested variables include concrete slab thickness, composite screw angle, and single spline connection systems consisting of nails or screws. Experimental results and observed damage progression from cyclic testing are presented and discussed. Results indicate that CCC systems achieved increased stiffness and strength values when compared to bare-CLT systems, but slab thickness did not influence the strength and stiffness of the system for the load paths simulated. Additionally, CCC floor systems with 45 degrees composite screw connectors displayed increased strength but overall similar stiffness values when compared to the CCC systems with 90 degrees composite screws. The results provide useful engineering parameters, such as elastic stiffness, peak load, displacement capacity, and ductility ratios that can be used in the development of codified design parameters or in performance-based designs.
出版年：	2021
期刊名称：	Journal of structural engineering
卷：	147
期：	10