桥梁结构非平稳随机抗震分析  

Seismic Analysis of Bridge Structure Subjected to Nonstationary Random Ground Motion

作　　者：但庆文 张传勇[1] 刘章军[1] Dan Qingwen;Zhang Chuanyong;Liu Zhangjun(College of Civil Engineering ＆ Architecture,China Three Gorges Univ.,Yichang 443002,China)

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2018年第5期58-62,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(51278282)

摘　　要：基于平稳地震动过程的Kanai-Tajimi功率谱密度函数,建立了一类时-频非平稳地震动过程的演变功率谱模型.结合公路工程抗震规范和非平稳过程模拟的随机函数-谱表示方法,生成了610条桥梁抗震设计所用的地震动概率模型的代表性时程集合,通过代表性时程的均值、标准差及平均反应谱值与目标值的比较验证了本文方法的有效性.在此基础上,结合概率密度演化方法,对范和港跨海斜拉桥随机地震反应与抗震可靠度进行了精细化的分析,为桥梁结构抗震分析提供参考.Based on the Kanai-Tajimi power spectral density funtion of stationary earthquake processes, a class of evolution spectrum model of time frequency nonstationary ground motion is suggested. According to the Seismic code for Highway Engineering and the simulation method of hybrid spectral representation and random function for nonstationary stochastic processes, a complete set of representative seismic time histories with seismic probabilities for aseismatic design of bridge is generated. Through the comparison of the mean, standard deviation and the average response spectrum of representative seismic time histories with the target values, the effectiveness of the proposed method can be demonstrated. And then, in conjunction with probability density evolution method, the seismic response analysis and reliability calculation of the bridge are performed.

关 键 词：非平稳地震动 时-频非平稳性 演变功率谱 桥梁结构 抗震可靠度 

分 类 号：P315[天文地球—地震学]