基于非线性正装迭代法的三塔结合梁斜拉桥施工索力确定  

Determination of Cable Force in the Construction of Composite Girder Cable-stayed Bridge with Three Pylons

作　　者：林驰 

机构地区：[1]武汉市城市建设投资开发集团有限公司,武汉430030

出　　处：《武汉理工大学学报》2012年第9期109-112,共4页Journal of Wuhan University of Technology

基　　金：武汉市科技攻关项目(201160923308)

摘　　要：如何确定合理的施工索力使得该桥成桥后处于合理的受力状态是大跨径斜拉桥施工过程中的关键问题。文中以武汉二七长江大桥为工程背景,考虑几何非线性,以大型通用有限元分析软件Midas为平台,建立三塔结合梁斜拉桥施工阶段空间非线性仿真分析有限元模型。采用正装-迭代的分析方法,根据新增斜拉索的竖向分力应基本与新增主梁节段的重力相同的基本思想计算施工阶段斜拉索的初始张拉力,经过多次迭代,确定了该桥合理的施工索力。计算结果为该桥的合理施工提供参考。How to determinate the reasonable cable force which makes the bridge after finished in a reasonable forced state is the key problem in the construction process of long-span cable-stayed bridge.This paper takes Wuhan Erqi Yangzi River Bridge as the engineering background.Considering geometric nonlinearity,using the large general software Midas as the platform,the space structure nonlinear finite element model of composite girder cable-stayed bridge with three pylons is established to simulate and analyze each working procedure of cantilever construction.The initial cable tension in construction is calculated in the forward iteration method,based on the basic ideal that the new stay-cables vertical force should be equal to the gravity of new girder section.Finally,the reasonable cable force in construction is determinated through multi-iterations,and the calculated results can be applied in construction.

关 键 词：几何非线性 结合梁斜拉桥 正装-迭代 施工索力 成桥索力 

分 类 号：U448[建筑科学—桥梁与隧道工程]