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工程力学  2012 

非弹性体系地震动力响应分析的新型单轴Bouc-Wen模型

DOI: 10.6052/j.issn.1000-4750.2011.05.0286, PP. 265-273

Keywords: 地震延性需求,Bouc-Wen模型,P-?效应,强度退化,刚度退化,捏拢效应

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Abstract:

对经典的单轴Bouc-Wen模型进行改进,研究建立了可以综合考虑P-?效应、捏拢效应、强度退化、刚度退化、应变硬化等典型滞回特性的新型单轴Bouc-Wen模型。根据非弹性单自由度体系在69条强震记录作用下的动力响应,定量地分析了P-?效应对地震延性需求的均值和变异系数的影响,进而建立了地震延性需求的经验概率分布模型和预测方程。计算结果显示:由重力引起的P-?效应对地震延性需求的影响较大,而由竖向地震激励引起的P-?效应的影响很小;地震延性需求与震级、震中矩、剪切波速等参数之间的线性相关性较小;对于短周期体系,可以采用Lognormal或Frechet分布来描述地震延性需求的概率分布,而对于长周期体系,采用Frechet分布则更为合理。

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