基于梁桥性能的矮塔斜拉桥成桥状态确定方法  

Determination method of finished bridge state of extradosed cable-stayed bridge based on performance of beam bridge

作　　者：涂光亚[1] 刘静 江兴 陈林伟 TU Guangya;LIU Jing;JIANG Xing;CHEN Linwei(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木与环境工程学院,湖南长沙410114

出　　处：《交通科学与工程》2025年第2期114-120,共7页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(51878073)。

摘　　要：【目的】为合理地确定矮塔斜拉桥的成桥状态,提出一种基于梁桥受力性能的确定方法。【方法】首先不考虑索力和预应力作用,求得斜拉索在中支点处所承担的弯矩;接着以各斜拉索的竖向分力相等为原则,根据弯矩平衡求得初张索力;然后考虑索力作用,以主梁应力为控制目标,对预应力筋进行估算与布置;最后采用正装计算与荷载组合对合理成桥状态进行验证。【结果】以石滩大桥为算例进行验证,计算结果表明:所得初张索力与成桥索力由支点至跨中逐渐增大且变化均匀;主梁弯矩呈现出明显的普通梁桥的受力特征;主梁各截面的上下缘应力均满足矮塔斜拉桥对成桥状态的要求。【结论】所确定的成桥状态符合规范要求,验证了该方法的可行性,为同类型桥梁合理成桥状态的确定提供了新的思路。[Purposes]To determine the finished bridge state of an extradosed cable-stayed bridge quickly and reasonably,this study proposes a method based on the stress performance of beam bridges.[Methods]The bending moment value borne by the stay cable at the central support point was obtained by disregarding the cable force and prestress.According to the principle that the vertical force components of stay cables were equal,the initial cable force was calculated based on the moment equilibrium.Then,considering the cable force,the prestressed tendons were estimated and arranged with the main beam stress as the control target.Finally,the reasonable finished bridge state was verified by forward calculation and load combination.[Findings]With the Shitan Bridge as an example for verification,the calculation results show that the obtained initial cable force and the cable force of the finished bridge gradually increase from the support point to the mid-span and change uniformly.The bending moment of the main beam shows obvious stress characteristics of common beam bridges,and the stress on the upper and lower edges of each section of the main beam meets the requirements for the finished bridge state of extradosed cable-stayed bridges.[Conclusions]The determined finished bridge states all comply with the specifications,which verifies the rationality and feasibility of the proposed method.This study provides a new idea for determining the reasonable finished bridge state of similar bridges.

关 键 词：矮塔斜拉桥 合理成桥状态 斜拉索索力 主梁应力 梁桥 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]