水利学报2017，Vol.48Issue(11)：1348-1354,1362,8.DOI:10.13243/j.cnki.slxb.20170483
地震作用下混凝土坝时变动力可靠度的概率密度演化方法研究
Study on probability density evolution method for time-dependent dynamic reliability of concrete dams subjected to earthquake
摘要
Abstract
With the increasing of service time,the seismic capacity of concrete dams decreases because of the deterioration of material.Therefore,it is necessary to assess the life-cycle seismic safety of dams.Based on the theory of probability density evolution,this paper proposes a probabilistic analysis method of life-cycle seismic performance of concrete dams.The relative displacement angle as the index of performance evaluation is introduced,while the randomness and time variability of material are considered.Firstly,the probability density evolution equation is established for the extreme value of the dynamic nonlinear response of the dam in its service life.Then,the initial condition is obtained by employing the theory of the equivalent extreme value event and the equation is solved by the difference method.Finally,the time-dependent dynamic reliability is acquired in the safety domain.The validity of the method is verified through a numerical example.The results show that the proposed method can obtain probability evolution information of seismic performance and the development of the dynamic reliability of dams in its service life.Compared with the Monte Carlo method,the new method shows higher accuracy and efficiency.关键词
混凝土坝/退化/全寿命周期/概率密度演化/等价极值事件/时变动力可靠度Key words
concrete dam/deterioration/life-cycle/probability density evolution/equivalent extreme value event/time-dependent dynamic reliability分类
建筑与水利引用本文复制引用
陈健云,贾启彬,徐强..地震作用下混凝土坝时变动力可靠度的概率密度演化方法研究[J].水利学报,2017,48(11):1348-1354,1362,8.基金项目
国家重点研发计划(2017YFC0404900) （2017YFC0404900）
