钢管临时结构整体稳定性数值分析  

NUMERICAL ANALYSIS OF THE OVERALL STABILITY OF STEEL TUBE TEMPORARY STRUCTURE

作　　者：杨耀[1] 方淑君[1] 

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《钢结构》2016年第6期54-57,97,共5页Steel Construction

基　　金：国家自然科学基金项目(51378504)

摘　　要：近年来钢管临时结构在桥隧工程建设中应用日益广泛,施工过程中临时结构因为整体失稳而倒塌的工程事故屡有发生,故结构整体稳定性的理论分析显得十分重要。结合高速铁路建设中常用的大型钢管型钢组合结构、扣件式钢管满堂结构、扣件式钢管型钢组合结构3种支撑体系,基于MIDAS/Civil软件,采用数值分析方法计算分析结构的整体稳定性能。研究结果表明:在钢管临时结构支撑体系中,剪刀撑对整体稳定性影响较大,尤其是横桥向的剪刀撑;钢管满堂支架立柱顶部悬臂长度不足会引起支撑体系的局部失稳,不利于结构整体稳定性的发挥;扣件式钢管满堂结构和扣件式钢管型钢组合结构支撑体系稳定性能相近,大型钢管型钢组合结构支撑体系的稳定性能最好。In recent years,more and more steel tube temporary structures have been used in the construction of bridge and tunnel engineering,and the collapse accidents of temporary structures in the construction process occurred frequently because of overall instability,so it is practical significant to calculate and analyze the overall stability of structure,and provide references for the field engineering personnel. According to three types of bracing systems： composite structure of large steel tube and section steel,full structure of fastening-style steel tubular and composite structure of fastening-style steel tubular and section steel in the construction of high-speed railway,based on the software platform of Midas Civil,the overall stability of structure was calculated and analyzed by using numerical analysis method. The results showed that the bridging,especially in the transverse direction of bridge,had a significant effect on the overall stability of the structure of the bracing system of steel tube temporary structures. The short cantilever of the column tops could lead to local instability of the bracing system,which was not conductive to the overall stability of the structure. The stability performance of full structure of fastening-style steel tubular and composite structure of fastening-style steel tubular and section steel was similar,and the stability performance of composite structure of large steel tube and section steel was the best.

关 键 词：钢管支架 稳定性 剪刀撑 有限元 数值分析 

分 类 号：U445.57[建筑科学—桥梁与隧道工程] U455.4[交通运输工程—道路与铁道工程]