黄茅海超大跨三塔斜拉桥结构体系研究  

Research on Structural System of a Super-Long-Span Triple-Pylon Cable-Stayed Bridge of Huangmaohai Link

作　　者：鲜荣 徐源庆 刘得运 李冲 XIAN Rong;XU Yuan-qing;LIU De-yun;LI Chong(Guangdong Provincial Highway Construction Corporation,Guangzhou 511447,China;Huangmaohai Link Administration Center,Guangzhou 511447,China;CCCC Highway Consultants Co. ,Ltd. ,Beijing 100011,China)

机构地区：[1]广东省公路建设有限公司,广东广州511447 [2]黄茅海跨海通道管理中心,广东广州511447 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100011

出　　处：《桥梁建设》2021年第6期9-15,共7页Bridge Construction

基　　金：交通运输行业重点科技项目(2020-MS1-004);广东省交通集团科技项目(2020-2-1)。

摘　　要：黄茅海大桥为(100+280+2×720+280+100)m超大跨独柱塔双索面三塔斜拉桥。为研究该桥合理结构体系,使大桥在活载作用下满足主梁最大挠度L/450的性能目标,通过理论和数值计算的方法分析塔-梁约束体系、边跨辅助墩数量、斜拉索布置形式等对大桥竖向刚度的影响。结果表明:中塔弹性约束+边塔阻尼约束体系是较为合理的三塔斜拉桥约束体系,黄茅海大桥最终采用该约束体系,中塔弹性约束刚度为6.5×10^(5) kN/m,边塔阻尼系数为10000 kN·(m/s)^(-0.3);边跨设置辅助墩、增设辅助索均可提升三塔斜拉桥竖向刚度,黄茅海大桥采用设置1个辅助墩和5对辅助索的方案,辅助索采用传统钢索。设置交叉索对三塔斜拉桥竖向刚度的提升很有限,且会造成斜拉索受力和施工复杂,因此该桥不建议设置交叉索。The Huangmaohai Bridge is a triple-pylon cable-stayed bridge with two main spans of 720 m,two side spans of 280 m and two secondary side spans of 100 m.The pylons are mono-pole structures bearing single-plane stay cables.Theoretical calculation and numerical simulation were carried out to select the appropriate structural system that could make the deflection of the superstructure below the maximum value of L/450 under live loads.The factors that influence the vertical stiffness of the bridge were analyzed,including the pylon-girder restraint system,number of auxiliary piers in side span,and layout of stay cables.The appropriate restraint system for the triple-pylon cable-stayed bridge is to install elastic restraint at the central pylon and damping system at the side pylons.On the Huangmaohai bridge,the elastic restraint stiffness at the central pylon is 6.5×10^(5) kN/m,and the damping coefficient at the side pylons is 10000 kN·(m/s)^(-0.3).Adding auxiliary piers and cables in the side spans can improve the vertical stiffness of the triple-pylon cable-stayed bridge.On the Huangmaohai Bridge,one auxiliary pier and five pairs of auxiliary cables are added,and the auxiliary cables are conventional steel cables.Adding crossover cables exerts limited effect on the improvement of vertical stiffness of triple-pylon cable-stayed bridge,however,complicates the load bearing performance of the stay cables and the construction of the bridge.The crossover cable solution is not recommended.

关 键 词：三塔斜拉桥 结构约束体系 辅助墩 辅助索 交叉索 竖向刚度 结构方案 桥梁设计 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]