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随机地震下结构性能的跳变退化概率模型研究

DOI: 10.13197/j.eeev.2014.02.34.wangc.005, PP. 34-40

Keywords: 退化结构,随机地震,跳变退化,概率模型

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Abstract:

由于外部荷载和内部材料复杂时变特性的影响,服役结构的性能退化机制复杂。特别是在随机地震荷载等突发性因素下,结构性能的退化规律不再由确定性衰减函数描述。引入地震间隔时间为Gamma分布的标值点过程来描述地震发生的随机性,在对结构性能退化进行一般性描述的基础上,提出随机地震作用下结构性能的跳变退化模型。利用跳变退化模型,推求了工程结构在一次地震和多次连续随机地震作用下发生破坏的概率。分析表明,该模型可以分析工程结构一次或者数次地震作用下结构性能小于某个给定阈值水平的破坏概率,从而为确定合理的主动维护策略提供依据。

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