铁路景观桥—雁荡山特大桥的设计与施工研究0110.doc

铁路景观桥—雁荡山特大桥的设计与施工 金中凡1，董　涛2，陶 畅2，朱诗勇2，万善强2 （１.湖北城市建设职业技术学院，湖北　武汉　430205；２.华中科技大学土木工程与力学学院，湖北　武汉　430074） 摘要：雁荡山特大桥主桥是国内首次采用连续钢箱叠合拱桥结构。主梁由2－90m连续钢箱梁组成，两孔钢箱主拱间设置钢箱辅助拱，每孔主拱拱肋之间设7道一字横撑和2道X形组合横撑辅助拱肋设8道一字横撑，nsys软件建立全桥空间有限元模型，分析各种荷载下全桥受力状态和主要荷载工况下拱脚局部受力状态，结果表明各项指标均满足规范要求。并对钢箱梁拖拉过程进行模拟与方案比选，分析得到最佳施工方法。 关键词：铁路桥梁；连续钢箱叠合拱；桥梁设计；桥梁施工；　 Railway Landscape Bridge—Research of Design and Construction of Yandang Mountain Super Large Bridge JIN Zhongfan1 , Dongtao2 (1. Hubei Urban Construction Vocational and Technological College, Wuhan 430205；2.Huazhong University of science and technology, Wuhan 430074 )Yandang mountain super large bridge is the first trial with continuous steel box composite arch bridge structure in our country. The girder is consist of 2-90 continuous steel box beam. The relieving arch is installed between two steel box main arch. There are 7 waling and 2 X waling between every arch rib of the main arch and 8 between the relieving arch. Also 13 booms is installed in every arch, which makes the shape of the bridge unique and beautiful. The spatial finite element model of the bridge was established by using ANSYS software, the stress state of the bridge under the action of various load and which of the arch springing under the action of main load case were analyzed, and the result indices that all indices of the bridge can satisfy the requirement of the specification. The drag process of the steel box beam was simulated and compared, the best construction scheme was founded after calculating. Keywords: railway bridge; continuous steel-box composite arch; bridge design; bridge construction; 1，工程背景 雁荡山特大桥是铁路重点工程之一，全长1603.06m，位于浙江省乐清市雁荡山镇境内，毗邻风景名胜雁荡山，沿桥跨越下塘小河网之环城河、甬台温高速公路、104国道等。主桥在DK196＋981.00处跨越甬台温高速公路，采用2-90m钢箱叠合拱桥。设计标准为新建时速200公里客货共线 2，结构设计 雁荡山特大桥的主桥采用钢箱梁与钢箱拱组合结构。主梁2－90m整体式连续钢箱梁，共划分为5个梁段（包括2个标准梁段，2个边支点梁拱结合段和1个中支点梁拱结合段）。其中钢箱梁采 图1 全桥效果图 用单箱九室等高度箱形截面，顶宽14.80m，底宽12.60m，中支点附近局 部底宽13.11m，钢箱梁底板横向水平，顶板横向倾斜形成2％的双向横坡，最大梁高为2.20m。钢箱梁内部