断索对钢-混组合梁斜拉桥力学性能的影响
Influence of cable breaking on mechanical properties of steel-concrete composite girder cable-stayed bridge
刘耀东 1李文涛 1王克兵2
作者信息
- 1. 湖北工业大学 土木建筑与环境学院,湖北 武汉 430068
- 2. 中铁大桥科学研究院有限公司,湖北 武汉 430034;桥梁结构健康与安全国家重点实验室,湖北 武汉 430034
- 折叠
摘要
为研究拉索断裂对钢-混组合梁斜拉桥力学性能的影响,以某在建钢-混组合梁斜拉桥为工程背景,采用MIDAS/Civil建立有限元仿真模型,将该模型的各参数与设计值及现场实测值进行对比以验证有限元模型的合理性,分析不同位置、不同数量的拉索断裂后主梁线形、拉索索力及索塔位移的变化规律.研究结果表明:边跨断索对主梁挠度、索塔位移的影响大于主跨断索,主跨断索对拉索索力的影响大于边跨断索;长索断裂对主梁线形、拉索索力、索塔位移的影响均为最大;拉索沿主梁跨中对称断裂时,主梁线形、拉索索力、主塔位移表现出对称变化的规律,且两对索断裂时全桥索力符合叠加原理.
Abstract
In order to study the effect of cable breakage on the mechanical performance of steel-hybrid cable-stayed bridges,a steel-hybrid cable-stayed bridge under construction was used as the engineering background,and a finite element simulation model was established by using MIDAS/Civil.Firstly,the parameters of the model were compared with the design values and the field measured values to verify the rationality of the finite element model.Then,the changes of main beam line,cable force and tower displacement were analyzed after different locations and numbers of broken cables.The results show that the effect of side span breakage on main beam deflection and tower displacement is greater than that of main span breakage,and the effect of main span breakage on cable force is greater than that of side span breakage;the effect of long cable breakage on main beam line,cable force and tower displacement is the greatest;when the cable breaks symmetrically along the span of main beam,the line of main beam,cable force and tower displacement show symmetrical changes,and when two pairs of cables break,the cable force of the whole bridge is in accordance with the superposition principle.The whole bridge force is in accordance with the superposition principle when two pairs of cables break.
关键词
钢-混组合梁斜拉桥/力学性能/拉索断裂/边跨断索/主跨断索Key words
steel-concrete composite girder cable-stayed bridge/mechanical properties/cable breakage/side span breakage/main span breakage引用本文复制引用
基金项目
国家自然科学基金项目(51708188)
湖北省教育厅研究生教学改革研究项目(校2021026)
示范性产教融合专业学位研究生联合培养基地建设项目(校2022054)
出版年
2024
国家科技期刊平台
NSTL
万方数据