小半径曲线双索面部分斜拉桥结构设计

摘要:

在城市与公路桥梁建设中，大跨径小半径曲线桥梁目前多采用连续刚构或连续梁，在后期运营中都存在腹板开裂和跨中挠度大等问题。曲线部分斜拉桥是一种经济合理兼具良好景观效果的结构形式，而国内外设计、修建的曲线部分斜拉桥数量很少，相关研究也局限于直线部分斜拉桥范围，故曲线部分斜拉桥的实践和研究意义重大。九江市新建快速路跨昌九快速路节点桥是目前国内平曲线半径最小的空间双索面部分斜拉桥，通过对该桥的设计及分析研究，总结出该种桥型结构设计的一些有用的经验，可供类似桥梁设计提供有益的参考。

Abstract:

In the construction of urban and highway bridges,the continuous rigid frame or continuous beam is often used in the long-span curve bridges with small radius. Howerver,There are so many problems in the later operation, such as web cracking and large mid-span deflection.The curve extradosed cable-stayed bridge is an economical and reasonable structure form with good landscape effect,but the number of curvilinear partial cable-stayed bridges designed and built at home and abroad is very few,and the related research is also limited to the scope of straight-line extradosed cable-stayed bridge,therefore,the practice and research of curve extradosed cable-stayed bridge is of great significance. Based on the design and analysis of the Joint Bridge over ChangJiu Expressway of New Expressway in JiuJiang,which has the smallest radius of horizontal curve in China,some useful experiences of this kind of bridge structure design are summarized,which can provide useful reference for similar bridge design.