斜拉桥施工期取代临时墩的拉索平衡结构体系研究  

Study of Cable Balancing System to Replace Temporary Piers During Construction of Cable-Stayed Bridge

作　　者：刘明虎[1] 孟凡超[1] 李国亮[1] 孙鹏 LIU Ming-hu;MENG Fan-chao;LI Guo-liang;SUN Peng(CCCC Highway Consultants Co., Ltd., Beijing 100088, China;CCCC-SHEC First Engineering Co., Ltd., Wuhan 430019, China)

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]中交二公局第一工程有限公司,湖北武汉430019

出　　处：《桥梁建设》2020年第1期26-31,共6页Bridge Construction

摘　　要：斜拉桥上部结构双悬臂施工时,可采用临时拉索平衡结构体系代替传统的临时墩来抵抗不平衡荷载作用。为分析施工期拉索平衡结构体系下大跨度斜拉桥的结构受力和抗风性能,以港珠澳大桥青州航道桥为背景进行研究。基于平衡措施设计的基本原则,在桥梁边、中跨主梁与桥塔承台间设计了临时拉索连接的结构体系,采用MIDAS Civil软件建立全桥模型,分析双悬臂施工中最不利工况下的桥梁受力,并进行了比例为1∶70的全桥气动弹性模型风洞试验。结果表明:拉索平衡结构体系能够增强大跨径斜拉桥双悬臂施工状态下抵抗各种不平衡静荷载作用的能力,提高桥梁抵抗动风荷载作用的能力,降低施工期的抖振响应;拉索平衡结构体系下的桥梁受力和抗风性能均满足要求,该体系能够保证斜拉桥在上部结构施工中的结构安全。During the double-cantilever construction of the superstructure of cable-stayed bridge,a temporary cable balancing system can be deployed to replace the traditionally-added temporary piers to resist the unbalanced loading effects.To study the load bearing behavior and wind resistant performance of long-span cable-stayed bridge when the cable balancing system is used during the construction process,the Qingzhou Navigational Channel Bridge of Hong Kong-Zhuhai-Macao Bridge is taken as the study background.Based on the fundamental design principle of balancing set-ups,a balancing system formed by temporary cables installed between the main girders in the side and central spans and pile caps of the pylons was designed.The software MIDAS Civil was used to build the model of the overall bridge,to analyze the load bearing performance of the bridge under the most adverse loading condition during the double-cantilever construction.And a 1∶70 aeroelastic model of the overall bridge was built to carry out the wind tunnel test.The results show that the cable balancing system can increase the strength of the long-span cable-stayed bridge to resist various unbalanced static loads under the double-cantilever construction condition,enhance the capacity of the bridge to resist dynamic wind loads and reduce the buffeting responses of bridge components during construction.The load bearing capacity and wind resistant performance of the bridge with the cable balancing system can all meet the requirements,proving that the cable balancing system can ensure the structural safety of the cable-stayed bridge during the construction of the superstructure.

关 键 词：斜拉桥 临时墩 拉索平衡结构体系 悬臂状态 有限元法 风洞试验 受力分析 抗风性能 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]