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。
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.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2013年第2期28-32,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金创新研究群体科学基金资助项目(51021004)
关键词
退化结构
随机过程
时变可靠度
概率模型
deteriorating structures
stochastic process
time-varying reliability
probabilistic model
