单箱三室变截面矮塔斜拉桥主梁应力分析  

Stress Analysis of the Main Girder of the Three-box Variable-section of Extradosed Cable-stayed Bridge

作　　者：施静娴[1] 冉志红 

机构地区：[1]昆明理工大学津桥学院,云南昆明650106 [2]云南大学建筑与规划学院

出　　处：《内蒙古公路与运输》2017年第6期21-24,共4页Highways & Transportation in Inner Mongolia

基　　金：云南省教育厅基金资助性项目(2017ZZX319)

摘　　要：为了解矮塔斜拉桥施工至运营阶段主梁的应力变化,文章结合一座主梁采用单箱三室大悬臂变截面PC连续箱梁的混凝土矮塔斜拉桥,分析计算截面的应力发展情况和运营阶段徐变效应引起的矮塔斜拉桥主梁应力变化,结果表明:矮塔斜拉桥靠近主塔的无索区,运营30a后箱梁下缘应力值增值大在2MPa左右,而矮塔斜拉桥的无索区较长,应适当增加无索区箱梁下缘的应力储备。In order to understand the stress changes of the main girder of Extradosed Cable - stayed Bridge during the operation stage, in this paper, based on a Extradosed Cable - stayed Bridge, which is main beam of single - box three - chamber and large cantilever variable cross - section PC continuous girder stress,the stress development of the cross section and stress variation of main girder of Extradosed Cable - stayed Bridge Caused by Creep Effect in the operational phase are analyzed. The results show that the cable -stayed bridge is close to the non - stayed cable segment of main tower. After 30 years of operation, the stress value of the lower edge of the box girder increases greatly, which is about 2MPa. And the non - stayed cable segment of Extradosed Cable - stayed Bridge is longer and should increase the stress reserve of the lower edge of the non - cable box girder.

关 键 词：矮塔斜拉桥 应力 无索区 储备 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]