考虑行波效应的刚构桥地震反应与可靠度分析  

Analysis of Rigid Frame Bridge Seismic Response Considering Traveling Wave Effect and its Reliability

作　　者：张传勇[1] 刘增辉[1] 黄帅[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《安徽理工大学学报（自然科学版）》2017年第5期55-62,共8页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51778343;51278282)

摘　　要：为了对大型连续刚构桥进行精细化抗震设计与可靠度研究,在平稳地震动随机过程的功率谱密度函数基础上,应用了一类新的非平稳地震动随机过程的演变功率谱模型。结合《建筑抗震设计规范》,确立了演变功率谱模型的参数取值。同时,应用谱表示-随机函数方法模拟非平稳地震动随机过程,生成非平稳地震动随机过程的代表性时程样本。通过比较代表性时程样本的统计值与目标值的误差,验证了广义演变功率谱密度函数模型的优越性和合理性。最后,以重庆石板坡长江大桥为例建立有限元模型,进行了基于行波效应下的地震反应分析,并结合概率密度演化方法,给出了墩顶的抗震可靠度以及地震动反应概率信息。In order to study the seismic design and reliability of large scale continuous rigid frame bridges,this paper adopted an evolutionary power spectral model of non-stationary ground motions based on power spectral density function of stationary ground motions. In conjunction with Code for Seismic Design of Buildings,the parameter values of evolutionary power spectral model are determined. Meanwhile,applying spectral representation-random function method to simulated the non-stationary random processes,and generated the samples of representative time histories of non-stationary ground motions. Then,by comparing the error between the statistical values of representative time histories samples and the target values,the rationality and superiority of generalized evolutionary power spectral density function model were verified. Finally,the double-track bridge of Chongqing Shibanpo River Bridge was used as an example,to analyze the seismic responses subjected to traveling wave effect. And applying the probability density evolution method,probability information of seismic responses and seismic reliability of pier top were obtained.

关 键 词：非平稳地震动 演变功率谱 行波效应 抗震可靠度 概率密度演化 

分 类 号：P315[天文地球—地震学]