斜拉-悬索协作桥结合部合理设计研究  

Research on Rational Design of Connection Part for Combined Cable-stayed and Suspension Bridge

作　　者：唐亮[1,2] 张皓 刘玉擎[4] 

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]中交公路长大桥建设国家工程研究中心有限公司,北京100088 [3]云南省交通规划设计研究院,云南昆明650011 [4]同济大学土木工程学院,上海200092

出　　处：《公路交通科技》2016年第1期70-75,81,共7页Journal of Highway and Transportation Research and Development

基　　金：交通运输部科技项目(2011 318 494 160);国家高技术研究发展计划(八六三计划)项目(2012AA112501)

摘　　要：为了研究斜拉-悬索协作桥斜拉段和悬索段的合理过渡问题,基于琼州海峡跨海通道的主跨3 000 m协作桥方案,采用有限元方法,分析了协作桥结合部受力机理,并进一步研究了交叉吊索数量、过渡段主梁刚度等参数的影响。结果表明,协作桥结合部设计需解决端吊索稳定受拉、端吊索活载索力幅可控、以及主梁刚度过渡平顺3个关键难题;增设交叉吊索数量可以有效改善结合部受力性能,增加过渡段主梁刚度效果有限且成本较高。To study the rational transition between the cable-stayed segment and the suspension segment in a combined cable-stayed and suspension bridge,based on the scheme of Qiongzhou Strait combined bridge with a main span of 3 000 m,the working mechanism of the connection part is analyzed by finite element method.The effects of parameters such as the number of hangers intersecting with stayed cables and the stiffness of transition girder are studied. The result shows that（ 1） 3 key problems should be solved in the design of the connection part： the end hangers should always be in tension,the force amplitudes of the end hangers should be in control,and the stiffness transition of girder should be smooth;（ 2） increasing the number of intersecting hangers can effectively improve the structural performance of the connection part,while the effect of raising the girder stiffness is not distinct with high cost.

关 键 词：桥梁工程 结合部合理设计 有限元方法 斜拉-悬索协作桥 疲劳 松弛 刚度 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]