双索面斜拉桥主梁抗震强度的模糊可靠性分析  

A Fuzzy Reliability Analysis of the Bearing Capacity of Girder-Section of Double Rope Surface Cable-Stayed Bridges

作　　者：郭炽斌[1] 尹益辉[2] 朱宝龙[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010 [2]中国工程物理研究院总体工程研究所,绵阳621900

出　　处：《青岛理工大学学报》2010年第1期38-43,共6页Journal of Qingdao University of Technology

摘　　要：利用ANSYS有限元软件建立1座双索面斜拉桥的有限元模型,分析了其模态振型的特征和地震时程响应,找出了该桥主梁弯矩响应最大的截面;同时分析了影响地震弯矩响应与主梁抗弯承载力的模糊因素;然后分别利用常规可靠性分析的验算点法与模糊可靠性分析的区间数转化法对该桥主梁的抗弯强度进行了分析,结果指出该桥主梁在地震中有较好的安全性.Using ANSYS finite element software this paper establishes one pairs of cableplane cable-stayed bridge of finite element model, analyses the characteristics of the vibration mode and the seismic time-history of the bridge and then finds out the max section of the moment of the bridge＇s main beam. At the same time, it analyses the fuzzy factors of the seismic moment reaction and the main beam bending capacity. In conclusion, it analyses the bending strength of the cross-section by using the analysis of fuzzy reliability and the analysis of conventional reliability respectively. The results show that the main beam of the bridge has good security in the earthquake.

关 键 词：桥梁工程 地震 模态分析 时程分析 模糊可靠性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]