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首页> 外文期刊>Bulletin of earthquake engineering >Seismic force-modification factors for mid-rise wood-frame buildings with shearwalls using wood screws
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Seismic force-modification factors for mid-rise wood-frame buildings with shearwalls using wood screws

机译：使用木螺钉的剪切墙体中层木材框架建筑物的地震力修改因子

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摘要

Wood-screw shearwall (WSS) is generally considered to have limited ductility under seismic load. Conservatively, minimum ductility-related force-modification factor, R-d, of 1.0 and over-strength related force-modification factor, R-o, of 1.3 are used in the National Building Code of Canada for seismic design. In this study, the structural performance of WSS's with different thicknesses of wood-based panels and sizes of wood screws was investigated by conducting monotonic and cyclic loading tests. The combined force-modification factor RdRo was estimated based on shearwall test results. To verify the estimated modification factors, mid-rise light wood-frame buildings (LWFBs) with different numbers of storeys, wall aspect ratios, magnitudes of gravity and diaphragm flexibilities were designed and analysed numerically. Nonlinear dynamic analyses were performed with 22 scaled Far-Field earthquake time-history records. The seismic response of the mid-rise LWFBs with WSS's under design hazard level met the design criteria of strength and deformation, and the collapse margin ratios obtained by using a simplified FEMA P695 method complied with the requirements. The study indicates that it is appropriate to use an R-d factor of 1.5 and an R-o factor of 1.7 for seismic design of WSS's.
机译：木螺旋剪力墙（WSS）通常被认为在地震荷载下具有有限的延性。加拿大国家建筑抗震设计规范保守地使用了1.0的最小延性相关力修正系数R-d和1.3的超强度相关力修正系数R-o。在本研究中，通过进行单调和循环加载试验，研究了不同厚度人造板和不同尺寸木螺钉的WSS的结构性能。根据剪力墙试验结果估算了组合力修正系数RdRo。为了验证估算的修改系数，设计了具有不同层数、墙体纵横比、重力大小和横隔梁柔度的中高层轻型木框架建筑（LWFB），并进行了数值分析。对22个比例远场地震时程记录进行了非线性动力分析。WSS低于设计危险等级的中高LWFB的地震响应符合强度和变形设计标准，使用简化FEMA P695方法获得的坍塌裕度比符合要求。研究表明，在WSS的抗震设计中，R-d系数为1.5和R-o系数为1.7是合适的。

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