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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。
In order to investigate the torsional reaction law of the actual eccentric frame-shear structure under the action of earthquake, a set of examples of three-dimensional eccentric frame with different eccentricity were designed according to the specifications. The multi-wave nonlinearity under different seismic levels Dynamic time history analysis compares the elasto-plastic seismic responses such as interlayer displacement angle, torsion angle, plastic hinge distribution and ductile coefficient. The results show that the displacement response can meet the standard performance requirements when the displacement ratio is controlled within the high limit of 1.4. The ductility of rigid members is 2 to 3 times larger than that of flexible ones. At the bottom of the rigid side shear wall member, the demand of the ductility for the input of artificial large earthquakes is too large, which should be taken seriously.