广珠城际西江特大桥主桥空间受力分析  

3-Dimensional finite element analysis of Xijian River Bridge on Guangzhou-Zhuhai intercity rapid rail transit

作　　者：李建慧[1] 李爱群[1] 罗世东[2] 刘振标[2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]铁道第四勘察设计院,武汉430063

出　　处：《东南大学学报（自然科学版）》2009年第1期96-100,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重点资助项目(50538020)

摘　　要：为了准确模拟预应力混凝土独塔斜拉连续刚构组合桥型的空间受力特性,以大型通用有限元程序为平台,采用相应的建模策略和二次开发技术,建立三维空间精细化基准有限元模型,在此基础上编制相应的计算程序,分析研究西江特大桥主桥独塔斜拉和连续刚构2种体系在组合结构中的受力性能及其作用.对比分析了其主梁考虑预应力和不考虑预应力2种情况下组合结构的自振特性.计算结果表明:独塔斜拉刚构体系整体表现出刚构的受力特性,斜拉索作为安全储备可对结构的"刚度保持"起到重要作用;主梁预应力效应改变了组合结构的刚度体系,对组合结构的自振特性具有一定的影响.In order to accurately simulate the static and dynamic characteristics of the single pylon continuous cable-stayed rigid-frame hybrid girder bridge, general finite element program is used to establish a precise three-dimensional space FE（finite element） modal.The strategy for space finite element model and corresponding development technology are firstly introduced.Based on it,computer program is compiled.The performance of static and dynamic characteristics and the role of the cable-stayed continuous rigid-frame structure in hybrid structure are analyzed in detail;a comparative analysis of the dynamic characteristics of the bridge is taken for the girders with or without consideration of prestressing.The calculation results show that the combination system bridge as a whole is characterized with the rigid frame loading characteristics type,the stay cable as reserve safety will play an important role for the ＂stiffness kept＂ of the structure,and prestressing effect of girder changes structural stiffness system,which has some influences on dynamic characteristics for hybrid structure.

关 键 词：铁路桥 斜拉连续刚构 组合结构 空间受力分析 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]