46.5m大跨度弧形钢拱结构的稳定及其缺陷影响分析  

ANLYSES OF STABILITY AND IMPERFECTION EFEFCT OF 46.5m LONG-SPAN STEEL ARCH STRUCTURE WITH ARCH

作　　者：熊仲明[1] 韦俊[2] 曹欣[3] 王军良[1] 

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [2]苏州科技学院土木学院,江苏苏州215011 [3]山西省电力勘测设计院,山西太原030001

出　　处：《工程力学》2009年第11期172-178,共7页Engineering Mechanics

基　　金：陕西省教育厅专项基金项目(06JK260);陕西省自然科学基金项目(2003E230)

摘　　要：由于工程应用中空间钢拱结构跨度增大导致结构整体失稳问题越来越突出,且现有规范缺少专门的大跨钢拱结构设计方法,因此,该文以46.5m大跨度弧形钢拱结构实际工程为背景,综合考虑结构的跨度、变截面形式、初始几何缺陷、荷载布置和多种荷载工况,采用有限元ANSYS软件分别建立了单榀钢拱及整体结构的有限元模型,并对其进行了特征值屈曲分析和几何非线性分析,找出了单榀结构和整体结构的屈曲模态,研究了缺陷对单榀结构和整体结构的敏感程度。通过计算结果与试验结果对比,表现出较好的一致性。计算结果表明,结构对初始缺陷较为敏感,缺陷的存在会导致结构稳定承载能力显著降低,为指导该类结构体系的设计以及进行更深入的研究提供了基础资料。With the spans of spatial steel arch structures in the project becoming larger, the overall instability of structures becomes more and more serious. There are no special design techniques on large-span steel arch structures in current design criteria. In the paper, under the actual engineering background of a 46.5m Long-span Steel arch Structure with Arch, considering the long-span structures, variable cross-section form, the initial geometry defects, loading layout and a variety of load conditions, the single arch and the whole model structure were established by the ANSYS software. Then eigenvalue buckling analysis and geometrically nonlinear analysis were carried out, the buckling mode of the structure is identified and the effect of an initial geometric imperfection was studied. The comparison between the test data and that of a theoretical analysis shows that its calculated results accorde well with those from the test data. The results of calculation indicate that the structure is very sensitive to initial imperfection and the existence of the imperfection leads to a significant reduction in the stability load-carrying capacity. The foundational materials will be provided to guide the design of this type of structural systems and to carry out further investigations.

关 键 词：钢拱 大跨度结构 稳定 初始缺陷 非线性有限元分析 

分 类 号：TU393.3[建筑科学—结构工程] TU317.2