常州站钢结构屋盖整体稳定分析  

Analysis of Overall Stability of Steel Building Roof of Changzhou Station

作　　者：宋怀金[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2012年第12期95-99,共5页Journal of Railway Engineering Society

摘　　要：研究目的:常州火车站屋盖为大跨度空间钢结构,主要由钢箱梁拱和面外的刚性系杆、支撑组成,跨度较大。为了获得结构的整体稳定性能,指导结构设计,在多种不利荷载组合作用下,对该工程分别进行特征值屈曲分析和非线性稳定分析。研究结论:考虑几何非线性、材料非线性,按最不利原则施加初始几何缺陷,计算结构的非线性稳定屈曲系数,特征值屈曲分析和非线性有限元全过程跟踪分析结果表明:结构的几何非线性很强,且对结构有利;结构的失稳均为整体失稳;在最不利荷载组合情况下,整体稳定分析的结果均能满足规范要求;考虑几何和材料非线性的结构整体稳定分析,真实反应了结构的整体特性,分析结果可为结构设计提供可靠的理论依据。可为类似工程提供参考。Research purposes： The roof of the Changzhou Railway Station is of a large- span steel structure composed of the steel box - section girder, outer plane rigid tied and support, with large span. In order to obtain the overall stability of the structure to instruct the structure design, the analyses of the eigenvalue buckling and nonlinear stability of the roof under effects of multiple unfavorable load combinations were made. Research conclusions： The nonlinear stability buckling factor s of the structure was calculated on the basis of considering the geometric nonlinear and material nonlinear and exerting the initial geometric imperfection under the worst condition. The results of the trace analysis of the whole process of the eigenvalue buckling by using the nonlinear finite elements showed that the geometric nonlinearity of the structure was very strong and it was beneficial to the structure. The instability of the structure was the overall instability. In the case of the most unfavorable load combination, the analysis results of overall stability met the specification requirements. The analysis result of the overall stability on consideration of the geometric and material nonlinear truly reflected the overall characteristics of the structure , and the analysis results could provide reliable theoretical basis for the structure design . All of these can be as the reference to the similar projects.

关 键 词：屋盖结构 大跨度钢拱结构 稳定分析 几何非线性 

分 类 号：TU313[建筑科学—结构工程]