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工程科学与技术:2013,45(2):28-32
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退化结构时变可靠性分析的随机过程新模型
(天津大学 水利工程仿真与安全国家重点实验室)
New Stochastic Process Model for the Time-varying Reliability Analysis of the Deteriorating Structures
(State Key Lab. of Hydraulic Eng. Simulation and Safety,Tianjin Univ.)
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投稿时间:2012-07-06    修订日期:2013-01-17
中文摘要: 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。引入具有独立增量特性的Gamma过程来描述结构抗力的单调退化特征,采用Poisson随机过程和Bernoulli随机过程分别描述了结构所受荷载的变化,建立了抗力-荷载双随机过程体系;同时,基于穿越率的观点,提出了基于本文新模型的工程结构性能时变可靠性分析的计算方法,推求了结构时变可靠度表达式。分析表明,本文模型能够较好地描述退化结构随时间的抗力退化规律和荷载随机变化过程,可以为基于时变可靠度理论的结构评估和寿命预测提供理论依据。
Abstract:In order to study the deteriorating mechanism of the structure performance, the resistance of deteriorating structures was described by Gamma distribution which has a character of independent increment, the changing process of load was described by Poisson stochastic process and Bernoulli stochastic process respectively, then, the load-resistance double stochastic process system was established. Also, based on the conception of crossing rate, the new time-varying reliability analysis method for the engineering structure performance was put forward and the expression was calculated. Analysis showed that the new stochastic process model can better describe the degradation of resistance and the load variation process with time, so it can provide the theory basis for the evaluation of existing structures based on the time dependent reliability theory as while as the life prediction.
文章编号:201200525     中图分类号:    文献标志码:
基金项目:国家自然科学基金创新研究群体科学基金资助项目(51021004)
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张社荣,王超,孙博.退化结构时变可靠性分析的随机过程新模型[J].工程科学与技术,2013,45(2):28-32.
Zhang Sherong,Wang Chao,Sun Bo.New Stochastic Process Model for the Time-varying Reliability Analysis of the Deteriorating Structures[J].Advanced Engineering Sciences,2013,45(2):28-32.