布索方式对弦支穹顶结构稳定性能的影响研究  

Influence of cable-struts arrangement on stability of suspen-dome

作　　者：郭佳民[1] 董石麟[2] 袁行飞[2] 侯永利[3] 冯蕾[3] 

机构地区：[1]上海海事大学,上海200135 [2]浙江大学空间结构研究中心,浙江杭州310027 [3]内蒙古工业大学,内蒙古呼和浩特010051

出　　处：《土木工程学报》2010年第S2期9-14,共6页China Civil Engineering Journal

基　　金：浙江省自然科学基金(Y1091175);第四期上海市本科教育高地建设项目(B210008G);上海海事大学重点学科建设项目(A2010030)

摘　　要：弦支穹顶结构由上部单层网壳和下部索杆系统组成。为了解下部索杆系统的布置形式对弦支穹顶结构整体稳定性能的影响,确保结构在设计过程中合理布置下部索杆系统,以单层网壳以及9种不同索杆布置形式的弦支穹顶,共10种跨度均为122m的结构为研究对象,进行全跨荷载与半跨荷载下考虑初始几何缺陷与无初始几何缺陷的整体稳定性计算,提取结构失稳模态与结构稳定性系数,分析不同布索形式对结构稳定性的影响,并将计算结果与单层网壳结构的计算结果进行对比。分析结果表明:结构对初始几何缺陷较为敏感,结构的稳定性与下部索杆中撑杆的布置数量与位置有较大的关系,而与斜索的具体布置形式关系不大,且半跨荷载对结构更为不利。Suspen-dome includes single layer dome and the bottom tensegrity system.To further understand influence of cable-struts arrangement on stability of suspen-dome,to ensure reasonable arrangement of cable-struts be selected during practical designing,ten structures with 122m span including a single layer dome and 9 suspen-domes according to different cable-struts were selected.Stability of perfect structure and structure considering initial geometrical imperfections under full load and half load were analysed.Influence of cable-struts arrangement on stability of suspen-dome was analysed through buckling mode and stability factor,at the same time calculation results of suspen-dome were compared with single layer dome.Results show that structure is sensitive to initial geometrical imperfections,the stability is sensitive to position and number of under struts,not to distribution of radial cables.Structural stability is controlled by half load.

关 键 词：弦支穹顶 稳定性 索杆 初始几何缺陷 屈曲模态 

分 类 号：TU399[建筑科学—结构工程]