混合梁斜拉桥塔梁同步施工可行性分析  

Feasibility Analysis of Synchronous Construction of Pylon and Main Girder of Hybrid Girder Cable-Stayed Bridge

作　　者：顾箭峰[1] 曾祥红 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]广安市交通建设质量监督管理站,四川广安638000

出　　处：《桥梁建设》2016年第1期111-116,共6页Bridge Construction

基　　金：中国水利水电建设公司科技资助项目(2014-38)~~

摘　　要：为研究塔梁同步施工法对混合梁斜拉桥索力和成桥状态的影响,以某跨径(45+67+416+67+45)m的双塔双索面混合梁斜拉桥为例,采用MIDAS Civil有限元软件建立全桥鱼刺骨模型,模拟其采用塔梁同步和先塔后梁法施工的全过程,利用影响矩阵法计算其合理成桥索力、合理施工索力及最终成桥索力,对比分析桥梁采用2种施工方法的施工索力和成桥状态,并将计算值与实测值进行对比。结果表明:2种施工方法均能使桥梁达到合理成桥状态,且它们的施工索力和成桥状态均很吻合;塔梁同步施工桥梁的成桥索力、塔顶偏位的计算值和实测值基本一致,成桥技术状态良好。因此,大跨混合梁斜拉桥采用塔梁同步施工是安全可行的。To study the influences of the synchronous construction method of pylon and main girder on the stay cable forces and completed bridge state of the hybrid girder cable-stayed bridge, a hybrid girder cable-stayed bridge with double pylons, double cable planes and with span arrange- ment （45＋67＋416＋67＋45） m was taken as an example, the fishbone beam model for the whole bridge of the bridge was established, using the finite element software MIDAS Civil and the whole process of the synchronous construction method of the pylon and main girder and the method of constructing the pylon first and the main girder late was simulated. The reasonable completed bridge stay eable forces, reasonable initial stay cable forces and the final completed bridge stay ca- ble forces were calculated by the influence matrix, the initial stay cable forces and completed bridge state of the bridge constructed by the two construction methods were analyzed and the calculated and measured values were compared. The results indicate that with both the two construction methods, the reasonable completed bridge state of the bridge can be achieved and the initial stay cable forces of the two methods are accordant with the cable forces of the completed bridge state. The calculated and measured values of the completed bridge stay cable forces and pylon top dis- placement of the bridge constructed by the synehronous construction method of the pylon and main girder are substantially identical and the final completed bridge state is good. In such case, the construction of the long span hybrid girder cable-stayed bridge, using the synchronous construc- tion method of the pylon and main girder, is safe and feasible.

关 键 词：斜拉桥 混合梁 塔梁同步施工法 有限元法 仿真计算 索力确定 可行性分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]