城市大跨径钢箱梁设计与施工研究

Research on Design and Construction of Urban Long-span Steel Box Girder

摘要:

随着经济发展和城市化进程加速，我国市政桥梁建设发展迅猛，特别是大跨径桥梁逐渐增多。以合肥市繁华大道改造工程上跨既有高架（100 m主跨）钢箱梁为背景，结合国内外规范和标准，介绍了大跨钢箱梁的设计思路和方法；并结合项目特点，进行施工方案比选，详细阐述了多点步履式顶推施工方案。通过建立MIDAS空间有限元模型分别进行了对顶推施工过程和成桥状态的验算分析。结果表明：首先，针对大跨钢箱梁的设计及计算应综合国内外现有规范和标准；其次，施工前应加强方案论证比选工作，因此基于有限元模型的不利工况下模拟验算是十分有必要的。

Abstract:

With the development of economy and the acceleration of urbanization progress, the construction of municipal bridges in China has developed rapidly, and especially the number of long-span bridges has gradually increased. Based on the steel box girder spanning the existing viaduct (100 m main span) in the Hefei Fanhua Avenue Reconstruction Project, combined with the domestic and foreign codes and standards, the design ideas and methods of large-span steel box girder are introduced. Combined with the characteristics of the project, the construction schemes are compared and selected. The multi-point walking incremental launching construction scheme is elaborated in detail. The Midas Spatial Finite Element Model is established to carry out the checking analysis of the incremental launching construction process and the completed bridge state. The results show that firstly the design and calculation of long-span steel box girder should integrate the existing codes and standards at home and abroad. Secondly the comparison and selection of schemes should be strengthened before the construction. It is necessary to simulate, check and calculate the adverse conditions based on the finite element model.