某独塔混合梁斜拉桥施工分析

Rotating Construction Analysis of Single Tower Hybrid Girder Cable-Stayed Bridge

主梁沿梁的长度方向由两种不同材料组成的斜拉桥称为混合梁斜拉桥,一般主跨的梁体为钢梁,边跨的梁体为混凝土梁。某跨铁路桥是一座独塔混合梁斜拉桥,跨越既有铁路线,为了避免施工对铁路影响,采用转体法施工。论文介绍了该桥的结构设计要点以及施工流程,模拟整个施工过程的不同施工阶段,分析计算了不同施工阶段的斜拉索拉力,主梁变形形状,主要构件应力验算结果。为了精确配重,保证结构的稳定,提出称重配重的一般方法及原理。论文计算结果可为该项目施工控制提供理论依据,为类似工程提供参考和借鉴。

The cable-stayed bridge composed of two different materials along the length direction of the girder is called hybrid girder cable-stayed bridge. Generally, the beam of the main span is steel girder, and the side span is concrete girder. The background bridge is a single tower hybrid girder cable-stayed bridge, it is crossed the existing railway lines and is constructed by rotating method to avoid the dangers on the railway. This paper introduces the key technology of structural design and construction process of the bridge, simulates the different construction stages of the whole construction process, analyses and calculates the cable tension, main girder deformation shape and stress checking results of main components in different construction stages. In order to accurately weigh and ensure the stability of the structure, the general method and principle of weighing and weighting are put forward. The results of this paper can provide theoretical basis for the construction control of this project and provide reference for similar projects.