V型偏心支撑钢框架近场地震反应  

Seismic behavior of V-eccentrically braced steel frames under near-fault earthquake

作　　者：王华飞[1] 顾强[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2017年第3期1-6,共6页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金项目(51278320)

摘　　要：以位于发震断裂两侧5 km以内的V型偏心支撑钢框架为研究对象,依据现行《建筑抗震设计规范》(GB50011-2010)考虑近场地震作用,将地震动参数乘以放大系数1.5,设计了10层、15层和20层3个V型偏心支撑钢框架。为评价规范近场地震作用放大系数的合理性,根据场地条件和近场地震动特征选取了9条地震波,对所设计结构进行了弹塑性时程分析,得到结构的层剪力和层间位移角。结果表明,多遇地震下,3个结构的层剪力均大于规范近场设计地震作用,层间位移角均超过规范弹性限值1/250;罕遇地震下,3个结构的层间位移角均超过弹塑性限值1/50,不满足"大震不倒"的要求。V-eccentrically braced steel frames located on both sides of causative fault within 5km were studied.According to the current Code for Seismic Design of Buildings (GB50011-2010),the near-fault earthquake action was considered and the ground motion parameter was multiplied by the amplification factor 1.5,and then 10-story,15-story and 20-story V-eccentrically braced steel frames were designed.In order to evaluate the ra-tionality of amplification coefficient of the near-fault earthquake action in the seismic code,according to the site condition and the characteristics of near-fault records,9 seismic waves were selected and the nonlinear time his-tory analysis was carried out,the story shear and inter-story drift of V-eccentrically braced steel frames were ob-tained.The average story shear obtained through nonlinear time history method was larger than the design seismic action.The result shows that the inter-story drift of the three structures overtopped the limited value 1/250 and 1/50 under the frequent and rare earthquakes respectively,and the structures cannot meet 'no collapse under strong earthquake' under the rare earthquake.

关 键 词：近场地震 V型偏心支撑钢框架 层剪力 层间位移角 弹塑性时程分析 

分 类 号：TU391[建筑科学—结构工程]