六角星型穹顶结构易损性分析  

Vulnerability analysis of hexagonal star-type dome

作　　者：苏冠兴[1,2] 张志强[1] 叶继红[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]江苏省苏科建设技术发展有限公司,江苏南京210008

出　　处：《建筑结构学报》2013年第3期66-71,共6页Journal of Building Structures

基　　金：国家自然科学基金重大研究计划培育项目(90715005)

摘　　要：基于结构本身构型的易损性理论与结构失效机理相结合,分析了六角星型穹顶结构的易损性及杆件在荷载作用下的应力。结果表明,结构应力较大的杆件与易损性分析的失效杆件有对应关系,通过直接计算应力较大杆件的易损性参数,找到各种失效模式,可判断结构易损性。通过分析在反应谱拟合人工波和El Centro波作用下结构的失效模式,求得导致结构破坏的地震峰值加速度,研究了易损性特征参数与结构失效模式的关系。结果表明,结构连接能力小,易损性指数小时,结构呈现强度破坏,随着易损性指数的增大,结构失效模式由强度破坏转变为动力失稳。A hexagonal space dome was analyzed to investigate the relationship between structural vulnerability and failure mechanism. The analysis of stress ratios under design loads shows that the elements that have greater stresses are closely correlated to the deteriorating elements in structural vulnerability. By calculating the vulnerability parameters of elements of greater stresses, a variety of failure patterns can be found and the structural vulnerability can be estimated. Moreover, the relationship between vulnerability characteristic parameters and design uhimate load was discussed by analyzing the structural failure modes under artificial and E1 Centro ground motion waves. The limit peak acceleration of seismic waves resulting in structural damage was obtained. Based on the above analysis, when both the structural connectivity and the vulnerability index are small, the structure exhibits strength failure. With the increase of vulnerability of characteristic parameters, the failure pattern transforms from strength failure into dynamic instability.

关 键 词：六角星型穹顶 易损性 结构簇 数值分析 失效模式 动力稳定 失效机理 

分 类 号：TU393.301[建筑科学—结构工程]