摘要
内蒙古伊旗全民健身体育中心屋盖结构中部采用索穹顶结构体系,跨度71.2 m,为我国大陆地区首座大跨度索穹顶结构。首先建立结构有限元模型,分析在各设计荷载组合工况作用下索穹顶结构弹性阶段的受力特点,得出不均匀荷载对索穹顶结构更为不利。其次通过对结构体系的动力特性分析,得出索穹顶结构扭转刚度较弱,覆膜可有效地提高索穹顶整体结构的扭转刚度。重点对索穹顶结构体系进行弹塑性全过程分析,分析结构几何参数对结构力学性能的影响,得出索穹顶结构在承载全过程中经历的三个受力阶段:脊索松弛阶段、环索进入弹塑性阶段和结构破坏阶段。提出基于性能的索穹顶结构体系设计方法,并提出各阶段相应的变形性能指标和承载力控制指标。
The structural system of cable dome with span of 71.2 m is employed for the roof structure of the National Fitness Center in Ejin Horo Banner,Inner Mongolia.It＇s the first large-span cable dome structure in mainland of our country.Firstly,the whole finite element model of cable dome structure was established and subjected to static analysis under various design and normal load combinations.That the unevenly distributed load was detrimental for cable dome structure was put forward by analyzing the force-bearing characteristics of cable dome structure at elastic stage.Secondly,the conclusions were drawn that the torsional stiffness of cable dome was weak and the membrane can improve the torsional stiffness effectively by analyzing dynamic characteristics.Subsequently,the whole process of elasto-plastic bucking analysis for cable dome system was performed to obtain the three stages in the whole loading process：relaxation of ridge cable,yielding of loop cable and breaking of structure.Meanwhile the influence of geometrical parameters on structural elasto-plastic performance was analyzed.Finally,the design method of cable dome structure based on performance was proposed,the strength and deformation performance and bearing capacity control indexes at each stage were put forward.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第4期12-22,共11页
Journal of Building Structures
基金
国家自然科学基金重点项目(51038006)
住房和城乡建设部研究开发项目(2009-K2-4)
中国航空规划建设发展有限公司资助项目(技10研-19)
关键词
索穹顶结构
脊索松弛
环索进入弹塑性
稳定承载力
变形性能
cable dome
ridge cable relaxation
hoop cable yielding
stability bearing capacity performance
deformation behavior
