近场地震下人字形中心支撑钢框架地震反应  

Seismic behavior of concentrically braced steel chevron-frames under near-fault earthquakes

作　　者：张莉莉 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4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：按照《建筑抗震设计规范》(GB50011-2010),对处于发震断裂两侧5 km以内结构采用近场地震作用放大系数1.5,设计了10、15、20层人字形中心支撑钢框架;选取了16条近场地震记录,采用弹塑性时程方法分析了结构在近场地震波下的反应;同时,对规范考虑近场地震作用放大系数方法的可行性进行评价。结果表明:近场多遇地震下15、20层结构的层间位移角不满足规范要求;近场罕遇地震下15、20层结构均出现较大变形,不满足规范层间侧移角限值要求;时程分析得到的结构基底剪力也大于规范振型分解反应谱法计算值。According to Code for Seismic Design of Buildings （GB50011-2010）, within 5km, for structures situat-ed on both sides of the seismogenic fault, the near-fault seismic action should multiply intensification coefficient 1.5, with this method, the concentrically braced steel chevron-frames are designed respectively with ten-story, fifteen-story and twenty-story in this paper. A total of 16 near-fault ground motion records are selected on the research, and the seismic behavior of the three structures in near-fault ground motion is evaluated in terms of nonlinear time history analysis. The reliability of Code about the method of multiply intensification coefficient is also verified by the designed research. The analytical results indicate that the interstory drift angles of the fif-teen-story and twenty-story structures can not meet the requirements of Code under near-fault frequent earth-quake. The fifteen-story and twenty-story structures shows great deformation under near-fault rare earthquake which can not meet the requirements of Code. The value of base shear force from nonlinear time history analysis is higher than the results of response spectrum method

关 键 词：近断层地震 人字形中心支撑钢框架 地震反应 弹塑性时程分析 

分 类 号：TU391[建筑科学—结构工程]