偏心框剪结构地震作用下弹塑性扭转反应分析

为考察实际偏心框剪结构在地震作用下的扭转反应规律,按规范设计一组具有不同偏心率的实际框剪三维偏心结构算例,采用精细有限元模型进行不同地震水准下的多波非线性动力时程分析,对比其层间位移角、扭转角、塑性铰分布、延性系数等弹塑性地震反应。结果表明,位移比控制在高规要求的1.4限值内时,位移反应可满足规范的性能要求;刚性边构件的延性需求比柔性边大2倍～3倍;刚性地基假定下框剪结构的刚性边剪力墙构件底部在人工波大震输入时延性需求过大,应引起重视。

RULE OF ELASTO-PLASTIC TORSIONAL RESPONSE OF THE ECCENTRIC FRAME-SHEAR WALL STRUCTURE UNDER EARTHQUAKE ACTION

In order to investigate the rule of elasto-plastic torsional response of the eccentric frame-shear wall structure under earthquake action,a group of fine finite element models of actual frame-shear wall structure designed according to China code with different eccentricity were established for a comparative study in terms of their structural elasto-plastic seismic responses,such as the storey drift angle and torsional angle,distribution of plastic hinge,ductility coefficient,etc,using dynamic time-history analysis with many different seismic waves.The analysis results showed that the rule of elasto-plastic storey drift angle and interlayer torsional angle is consistent with the previous research using macroscopic model,and the storey drift angle satisfy the seismic requirements of code;the ductility demand of the rigid side elements is about 2~3 times large than that of the flexible side elements;the ductility demand of the rigid side elements of the frame-shear wall structure with rigid foundation assumption under artificial rare earthquake action is too large,which should be paid attention to.