大跨度新型桥梁地震动力可靠度分析  

Dynamic Reliability Analysis of Large-Span New-Pattern Bridge Under Earthquake

作　　者：李振宇[1] 余建星[1] 田佳[1] 丁宁[1] 

机构地区：[1]天津大学港口与海洋工程重点实验室,天津300072

出　　处：《天津大学学报》2010年第3期234-238,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50579047);教育部博士点基金资助项目(20060056023)

摘　　要：通过分析两座新型桥梁的地基情况和结构特点,指出了动力可靠性研究的必要性.基于地基土卓越周期公式,根据可靠度理论建立了极限状态方程和功能函数,以剪切波速为随机变量进行了统计分析和分布假设检验,检验结果表明,剪切波速符合正态分布.提出了大跨度新型桥梁可靠度计算步骤,编制了电算程序,计算得到了两座新型桥梁的可靠度指标,柳林桥为4.70,吉兆桥为4.75,表明两座新型桥梁满足结构动力可靠度的要求,采用的方法可为类似工程结构的研究提供参考.Through analysis of the ground condition and structural characteristic of two new-pattern bridges, the necessary to carry out the research on dynamic reliability under earthquake was indicated. Considering the eigen period formula of ground, limit state equation and functional function were established based on the reliability theory. Statistical parameter of wave shear velocity from geological exploration was calculated and its distribution checked which was testified to be of Gaussian distribution. Furthermore, zooming procedure was programmed with reliability theory to calculate the possibility of earthquake resonance disaster. Result indicated that the reliable index of Liulin Bridge was 4.70 and that of Jizhao Bridge was 4.75. It could be concluded that both new-pattern bridges meet the requirement of structural dynamic reliability to avoid earthquake resonance disaster. The method is a reference for researches of similar engineering structures.

关 键 词：可靠度 地震共振灾害 新型桥梁 大跨度 

分 类 号：TU279.7[建筑科学—建筑设计及理论]