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平面不对称结构非弹性地震反应分析的平扭耦联Bouc-Wen模型

, PP. 78-87

Keywords: 地震延性需求,平扭耦联效应,强度退化,刚度退化,捏拢效应

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Abstract:

综合考虑强度退化、刚度退化、捏拢效应等典型滞回特性的影响,建立了双向地震作用下平面不对称结构非弹性地震动力响应分析的平扭耦联Bouc-Wen模型。该模型采用圆形屈服面来描述双向抗侧恢复力之间的耦合效应,而采用锥体或球体屈服面来描述双向抗侧和抗扭恢复力之间的耦合效应,并结合69条强震记录,定量地分析了平扭耦联效应对平面不对称结构地震延性需求的概率统计特征的影响。计算结果显示球体屈服面比锥体屈服面更能合理描述双向抗侧恢复力和抗扭恢复力之间的耦合效应;地震延性需求的均值随着规一化屈服强度和非耦联平动自振周期的减小而增大。当非耦联平动自振周期较大时,地震延性需求的均值的对数与规一化屈服强度的对数近似成线性关系。平扭耦联效应可以明显增大地震延性需求的变异性,当非耦联平动自振周期和规一化屈服强度较小时尤为明显。

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