弯曲型与剪切型多自由度体系抗震强度折减系数比较分析  

Comparison of Seismic Strength Reduction Factors for MDOF Flexure-Type and Shear-Type Systems

作　　者：王慧英[1] 蔡健[1] 补国斌[1] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《湘潭大学自然科学学报》2013年第1期56-62,共7页Natural Science Journal of Xiangtan University

基　　金：湖南省自然科学基金项目(12JJ6047);教育部博士点基金项目(20094301120001)

摘　　要：研究弯曲型与剪切型多自由度体系的抗震强度折减系数的差异.采用4条中硬土类场地的地震动记录,以多质点系悬臂柱模拟弯曲型剪力墙结构,抗侧移串联弹簧系统模拟剪切型框架结构,通过非线性动力时程分析,研究楼层位移延性水平和基本振动周期对弯曲型结构抗震强度折减系数的影响,并比较与剪切型结构抗震强度折减系数的差异.分析结果表明:弯曲型结构的抗震强度折减系数比剪切型结构的抗震强度折减系数总体上约大40%;楼层数和位移延性水平是结构抗震强度折减系数的重要影响因素.The difference of strength reduction factors between flexure-type and shear-type multi-degree- freedom （MDOF） systems are studied. Multi-mass column cantilever systems are used to simulate flexure- type shear-wall structure, and multi-mass series spring connection systems are used to simulate shear-type frame structure. Four earthquake records in hard soil site are employed to execute nonlinear dynamic time history analysis. This work investigates the effects of storey displacement ductility and vibration period on the strength reduction factors for flexure-type structure, and compares the difference of strength reduction factors between flexure-type and shear-type structure. The results demonstrate that the strength reduction factors for flexure-type structure are above 40~ larger than those for flexure-type structure. In addition, storey displacement ductility and storey number are important influence factors to seismic strength reduction factors.

关 键 词：强度折减系数 多自由度体系 弯曲型结构 剪切型结构 

分 类 号：P352.1[天文地球—空间物理学]