重庆朝天门长江大桥工程设计创新要点

Design innovations in Chongqing Chaotianmen Yangtze River Bridge project

重庆朝天门长江大桥工程开创了国内外桥梁史上的多项之最。该项目以经典力学理论为基础,通过"桥梁结构设计系统"、MIDAS、ANSYS及STS等计算软件进行设计计算,利用AutoCAD、3dsmax、Fhotoshop等绘图软件绘制完成。朝天门长江大桥的主要技术成就包括:1)为当前已建成的世界上跨度最大的拱桥;2)使用了当前世界上承载力最大的球型支座;3)主桁杆件选用3种不同材质、变宽度尺寸,拼接板最大板厚达80 mm,均属国内首创;4)国内首次在钢结构桥梁永久结构中采用预应力体系,减少了钢材用量,降低了工程造价;5)上下十线车道及两线轨道的交通载荷量、多箱隔室凯旋门式主墩及公轨两用先拱后梁施工难度均堪称世界第一。

There are a lot of innovations in Chongqing Chaotianmen Yangtze River Bridge project.The design,analysis and calculation based on the theory of classical mechanics were carried out by the analysis software such as the bridge structure design system,MIDAS,ANSYS and STS,and the drafting software such as AutoCAD,3dsmas and Photoshop.The main achievements are as following： 1） Being the arch bridge with the longest span among all the existed ones;2）Utilizing the spherical support with the largest bearing capacity up to now all over the world;3）Adopting three kinds of materials and variable widths for the main truss rods,with the maximum thickness of 80mm for the splicing plate,both were the first applications in China;4） Adopting the prestressed system in the steel bridge permanent structure for the first time in China to reduce the steel consumption and cut down the cost;5）Overcoming the most difficult points in the world including the traffic load of upper-lower ten-lane road and two-lane track,the construction of multi-cellular triumphal arched main pier,and the road-track dual purpose arch-girder,etc.