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原文传递 Toe-Screwed Cross-Laminated Timber Shear Wall Trilinear Pushover Design Modeling

题名：	Toe-Screwed Cross-Laminated Timber Shear Wall Trilinear Pushover Design Modeling
正文语种：	英文
作者：	Dillon Fitzgerald, A.M.ASCE; Arijit Sinha, A.M.ASCE; Thomas H. Miller, M.ASCE;John A. Nairn
作者单位：	Oregon State Univ
关键词：	Cross-laminated timber; Self-tapping screw; Toe screw; Shear wall; Connection design; Nonlinear modeling; Equivalent-energy-elastic-plastic (EEEP) curve; ASCE/SEI 41; Pushover analysis
摘要：	Although toenailing has been common practice in light-frame residential construction, using toe screws in cross-laminated timber (CLT) shear walls has not been investigated. CLT shear walls with inclined washer-headed, self-tapping screws installed along the waifs bottom edge into a floor plate were tested to evaluate the shear wall connection. The tested geometry represents platform construction wall-to-floor conditions at the top and bottom of walls in multistory timber buildings. Three CLT shear wall connections—qually spaced toe screws, grouped toe screws, and a combination of toe screws and hold-downs一were tested under monotonic and cyclic loading. The full-scale CLT walls had a 2:1 aspect ratio; their performance was compared to that of other CLT metal connections, light-frame-shear walls (LFSWs), and the presented design method. Wall properties, backbone curves, ductility, equivalent-energy-elastic-plastic (EEEP) curves, and standard idealized-component backbone, nonlinear modeling parameters, and acceptance criteria were extracted for nonlinear static pushover analysis. Toe-screwed (TS) CLT shear walls exhibited significant energy dissipation due to the head pull-through failure mode found in connection assembly testing. All tests had significant hysteretic pinching and CLT damage. Walls displayed 2.6%-3.7% drift and good strength with rapid secondary backbone degradation. Toe-screwed CLT shear connections using partially threaded, washer-head screws exhibited high strength, stiffness, large hysteresis loops, and ductility compared to other CLT metal connections and LFSWs. The equally spaced and grouped toe-screw connection conditions exhibited 3.4% drift capacity and strength and energy dissipation comparable to those of the wall connections in the reviewed literature. Walls with toe screws and hold-downs exhibited higher strength, lower drift capacity, and good stiffness compared to the equally and grouped toe-screw walls. The results suggest that washer-head, partially threaded toe screws are a viable connection in lateral-force-resisting systems.
出版日期：	2020
出版年：	2020
期刊名称：	Journal of Structural Engineering
卷：	Vol.146
期：	No.07
页码：	04020130