初始几何缺陷对大跨张弦桁架结构整体稳定的影响研究

详细信息    查看全文 | 推荐本文 |

英文篇名：INFLUENCE OF INITIAL GEOMETRICAL IMPERFECTIONS ON OVERALL STABILITY OF LONG-SPAN TRUSS STRING STRUCTURE 作者：古莉 ; 龚景海 ; 鲁博宽 英文作者：GU Li;GONG Jinghai;LU Bokuan;Department of Civil Engineering,Shanghai Jiao Tong University; 关键词：大跨结构 ; 张弦桁架 ; 整体稳定 ; 初始缺陷 英文关键词：long-span structure;;truss string structure;;overall stability;;initial geometrical imperfections 中文刊名：GJIG 英文刊名：Steel Construction 机构：上海交通大学土木工程系; 出版日期：2019-03-22 出版单位：钢结构 年：2019 期：v.34;No.243 语种：中文; 页：GJIG201903011 页数：5 CN：03 ISSN：11-3899/TF 分类号：69-73

摘要

张弦桁架结构在大跨空间结构中应用越来越广泛,如何确保此类结构的整体稳定性是钢结构领域面临的重要课题。首先以某185 m跨张弦桁架柱面煤棚为背景,分析了满跨活荷载、半跨活荷载和风荷载作用下不同初始缺陷对该结构整体稳定性能的影响,发现在该结构设计中,以理想结构的静力失稳模态作为结构的初始几何缺陷,比"一致缺陷模态法"对结构的整体稳定性有更显著的影响。再建立跨度为120,140,160,180,200 m的类似柱面张弦桁架模型并分别分析其整体稳定性。研究结果表明:此类张弦桁架结构对初始缺陷不敏感,静力失稳模态作为初始缺陷与一阶模态相比更加不利。
        As the truss string structure becomes more and more widely used in long-span space structures,how to ensure the structural stability of long-span structure is an important problem in the field of steel structure. Firstly,the effects of different initial geometrical imperfections on the overall stability of the truss string structure under full-span live load,half-span live load and the wind load were analyzed based on a coal shed with a span of 185 meters in the paper. It was found that the static instability mode of the ideal structure used as the initial geometric imperfection had a more significant influence on the overall stability of this structure than the consistent imperfect buckling analysis method( CIBAM)advocated by the standard. Then the overall stability of several truss string structure models with span of 120 m,140 m,160 m,180 m and 200 m was calculated respectively. It was concluded that these structures were not sensitive to the initial geometrical imperfections and the static instability mode used as initial geometrical imperfections was more dangerous than the first order mode.

引文

[1] GIONCU V. Buckling of Reticulated Shells:State-of-the-Art[J].International Journal of Space Structures,1995,10(1):1-46.
    [2]李忠学.初始几何缺陷对网壳结构静、动力稳定性承载力的影响[J].土木工程学报,2002,35(1):11-14.
    [3]郑晖.折板网壳结构整体稳定分析中最不利初始几何缺陷的探讨[J].特种结构,2015(6):7-10.
    [4]张爱林,张晓峰,葛家琪,等. 2008奥运羽毛球馆张弦网壳结构整体稳定分析中初始缺陷的影响研究[J].空间结构,2006,12(4):8-12.
    [5]罗昱.改进的一致缺陷模态法在单层网壳稳定分析中的应用研究[D].天津:天津大学,2007.
    [6] BALUT N,PORUMB D,GIONCU V. Some Aspects Concerning the Behavior and Analysis of Single-Layer Latticed Roof Structures[C]∥Proceedings of the 3rd International Colloquium on Stability of Metal Structures. Paris:1983.
    [7]乐慈,袁海峰,杨洁,等.天津梅江会展中心张弦桁架稳定性分析[J].建筑结构,2015(14):72-76.
    [8]郝华文.单层球面网壳结构考虑不同初始缺陷和温度等因素影响的非线性稳定分析[D].合肥:安徽建筑大学,2014.
    [9]武玉.大跨度煤仓上部双层网壳结构的设计与稳定性研究[D].北京:北京科技大学,2011.