强震作用下钢框架结构的残余侧移研究  

Research on residual drift response of steel frames under strong earthquakes

作　　者：张倩[1,2] 梁兴文[2] 熊二刚[3] 

机构地区：[1]西安欧亚学院建筑工程学院,陕西西安710065 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]长安大学建筑工程学院,陕西西安710061

出　　处：《地震工程与工程振动》2015年第1期126-134,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51278402;51108035);陕西省自然科学基金项目(2010JQ7006);中国博士后科学基金项目(20100481313);陕西省教育厅专项科研计划项目(14JK2073);西安欧亚学院科研项目(12-ZKB-05)

摘　　要：根据现行规范设计的钢框架结构在强震作用下会产生较大的不可恢复的塑性变形,震后残余变形过大的结构往往无法修复到正常使用状态,最终只能被拆除,造成了严重的直接以及间接经济损失,因而准确分析结构的残余变形对于震后结构性能的评估与控制具有重要意义。为了研究钢框架结构在强震作用下的残余侧移,本文根据现行抗震设计规范和钢结构设计规范设计了2至10层的5个钢框架结构,分别采用静力非线性和动力时程分析方法对所设计结构进行了数值分析,得到了结构在中震和大震作用下的峰值侧移、残余侧移和侧移集中系数。结果表明,所得的残余侧移具有较大的离散性。基于分析结果,提出了预测钢框架结构残余侧移的计算公式,该公式为峰值侧移、弹性侧移以及侧移集中系数的函数。Steel frames designed according to strong earthquakes. The structures subjected current codes will undergo an unrecoverable plastic deformation under to excessive deformations after earthquakes cannot be desirably re- paired to their serviceable state, and can only be demolished, which brings about a serious direct and indirect eco- nomic loss. Thus an accurate prediction of the residual drift is of great significance to the performance evaluation and control of structures after earthquakes. In order to investigate the residual drift response of steel frames under strong earthquakes, steel frames between 2 and 10 stories in height are designed according to code for seismic de- sign of buildings and code for design of steel structures in this study. The designed merically by pushover analysis and elasto-plastic time history analysis. Furthermore, and drift concentration factors are reasonably obtained under the action of moderate structures are investigated nu- the peak drifts, residual drifts earthquakes and severe earth- quakes. The results indicate that the scatter in the residual drift results is a bit large. On the basis of analysis re- sults, calculation formulae are proposed to estimate the residual drifts of steel frames as a function of the expected peak drifts, the initial recoverable elastic drift, and the drift concentration factor of steel frames.

关 键 词：钢框架结构 残余侧移 推覆分析 弹塑性时程分析 峰值侧移 

分 类 号：TU391[建筑科学—结构工程] P315.91[天文地球—地震学]