【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。更多还原

【Abstract】 Steel frames designed according to current codes will undergo an unrecoverable plastic deformation under strong earthquakes. The structures subjected to excessive deformations after earthquakes cannot be desirably repaired to their serviceable state,and can only be demolished,which brings about a serious direct and indirect economic 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 design of buildings and code for design of steel structures in this study. The designed structures are investigated numerically by pushover analysis and elasto-plastic time history analysis. Furthermore,the peak drifts,residual drifts and drift concentration factors are reasonably obtained under the action of moderate earthquakes and severe earthquakes. The results indicate that the scatter in the residual drift results is a bit large. On the basis of analysis results,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.更多还原