既有火车站斜拉索桁架雨棚的索力调整施工模拟研究  

Simulation Study on Cable Force Adjustment Construction of Cable-stayed Truss Canopy Structure for Existing Railway Stations

作　　者：廖冰 LIAO Bing(Tong’en(Shanghai)Engineering Technology Co Ltd,Shanghai 200433,China)

机构地区：[1]同恩(上海)工程技术有限公司,上海200433

出　　处：《建材世界》2025年第2期101-105,共5页The World of Building Materials

摘　　要：既有大跨度斜拉索桁架雨棚结构存在索力松弛或超张紧的问题,需进行索力调整使索力重新分布均匀,以避免雨棚结构的不利变形持续增大。该文以某既有火车站斜拉索雨棚为研究对象,采用差值迭代法模拟了不同调索次序下的斜拉索雨棚索力调整施工过程。比对分析结果表明,调索次序对既有雨棚结构的终态索力和变形分布,以及施工过程的安全性,均有显著影响。对于单榀主桁架,受力相对独立的一组拉索应同步调整索力,以有效控制桁架挠度和柱顶位移的变化幅度,避免出现结构变形往复转折增大和减小的现象;对于多榀主桁架,应按照结构变形从大至小排列调索次序,以有效控制连接次桁架杆件的内力变化,防止发生局部杆件屈曲破坏。Large-span cable-stayed truss canopy structures in service often exhibit problems such as cable force relaxation or over-tensioning,necessitating adjustments to achieve a uniform redistribution of cable forces and mitigate the progressive aggravation of unfavorable structural deformations.This article takes the cable-stayed canopy of an existing railway station as the research object,and employs the difference iteration method to simulate the construction process of cable force adjustment under different cable adjustment sequences.The comparative analysis of simulation results reveals that the sequence of cable force adjustments has a significant impact on the final distribution of cable forces,the deformation patterns of the canopy structure,and the safety during the adjustment process.For single main trusses,cable groups that are relatively independent in their stress responses should undergo synchronized adjustments to effectively control truss deflection and limit variations in column top displacement,thus avoiding cyclic increases and decreases in structural deformation.For multiple main trusses,the adjustment sequence should prioritize cables in descending order of deformation magnitude to effectively regulate internal force changes in secondary truss members and prevent local buckling failures.

关 键 词：斜拉索雨棚 索力调整 施工模拟 调索次序 

分 类 号：TU391[建筑科学—结构工程]