塔梁分离式悬索桥若干问题研究  

The Study on Some Problems of Suspension Bridge With Separated Tower and Stiffening Girder

作　　者：刘汉彪[1] 胡建华[1,2] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《公路工程》2013年第4期61-65,119,共6页Highway Engineering

基　　金：国家西部交通建设科技项目(200631879846);湖南省交通厅科技项目(200517)

摘　　要：本文以湘西矮寨大桥工程为背景,针对塔梁分离式悬索桥存在的塔梁分离区域刚度跳跃和变形不协调造成的该区域构件受力分配不合理问题,通过逐步减小吊跨比对塔梁分离式悬索桥结构的应力、变形及疲劳性能进行系统的研究,分析得出塔梁分离式极限无索区长度,进而提出改善无索区受力性能的措施。研究表明钢桁加劲梁下弦杆的疲劳性能对吊跨比的变化最为敏感,是控制无索区长度进一步增大的主要因素;而在无索区设置竖向或斜向辅助地锚索能够使其性能得到明显的改善。This article,with Aizhai Bridge in Xiangxi as background which is a suspension bridge with separated towers and stiffening girder,for the problem that the stiffness discontinuity and deformation incompatibility in the area of main cables without suspenders which is resulted in the unreasonable force distribution among the members of this area,comprehensive study of the structure’s response under different ratio of suspension and span were maken to get the limit length of the main cables without suspenders of this kind of suspension bridge.The analysis showed that the fatigue problem of the bottom chord of the steel truss is very sensitive to the ratio of suspension and span and control the length of the main cables without suspenders further increasing;vertically or diagonally ground anchored cables are able to significantly improve its performance.

关 键 词：悬索桥 塔梁分离 无索区 吊跨比 极限无索区长度 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]