波形钢腹板PC组合箱梁桥异步施工对比分析

吴春旭¹，陈纪杰²，卢发亮^1*

1.山东交通学院交通土建工程学院，山东 济南  250357；2.济南轨道交通集团有限公司，山东 济南  250101

摘要：为解决采用传统悬臂施工对跨径较大桥梁造成变形较大、施工进度较慢、难以保证施工安全的问题，结合波形钢腹板预应力混凝土（prestressed concrete，PC）组合梁自身特点，以某特大桥梁为工程背景，应采用异步浇筑快速施工方法，采用有限元分析软件MIDAS Civil建立全桥有限元模型，将全桥划分为75个施工阶段进行施工全过程模拟，对比分析异步施工法和传统悬臂施工法在各施工阶段的应力和变形。分析结果表明：采用异步施工成桥后，模型中跨根部截面混凝土应力分布较普通悬臂施工均匀，成桥状态较合理，结构整体性能较好；采用异步施工法的桥梁变形小于传统悬臂施工法，施工荷载分布更有利于控制桥梁线形。

关键词：波形钢腹板；异步施工；有限元分析；应力；变形

Comparative analysis of asynchronous construction of PC composite box girder bridge with corrugated steel webs

WU Chunxu¹, CHEN Jijie², LU Faliang^1*

1.School of Transportation and Civil Engineering，Shandong Jiaotong University，Jinan 250357，China;

2.Jinan Rail Transit Group Co., Ltd.，Jinan 250101，China

Abstract:In order to solve the problem of large deformation of large span bridge beam caused by traditional cantilever construction, slow construction progress and difficult to ensure construction safety, combined with the characteristics of prestressed concrete(PC) composite beam with corrugated steel webs, taking a super large bridge as the engineering background, the asynchronous pouring rapid construction method is adopted, and the finite element model of the whole bridge is established with the finite element analysis software MIDAS civil. The whole bridge is divided into 75 construction stages to simulate the whole construction process, and the stress and deformation of the asynchronous construction method and traditional cantilever construction method in each construction stage are compared and analyzed.  The analysis results show that: The concrete stress distribution of the root section in the middle span of the model is more uniform than that of the ordinary cantilever construction after the bridge is completed by asynchronous construction, the completed bridge state is more reasonable, and the overall performance of the structure is better; The bridge deformation using asynchronous construction method is less than that of traditional cantilever construction method, and the construction load distribution is more conducive to control the bridge alignment.

Keywords:corrugated steel web; asynchronous construction; finite element analysis; stress; deformation