国家体育场钢屋盖结构地震损伤诊断模拟分析

为诊断大跨度空间结构的损伤,提出了三阶段损伤诊断方法,第一阶段确定可能损伤区域,第二阶段确定可能损伤单元,第三阶段确定可能损伤单元的损伤程度.提出了一种基于柔度矩阵差的损伤指标FDI,用于判定可能损伤区域;采用损伤定位向量法确定可能损伤单元;采用二阶特征灵敏度分析确定损伤程度.以国家体育场钢屋盖结构为算例,以罕遇地震作用下弹塑性时程分析结果为模拟损伤依据,完成了三种损伤模式的损伤诊断数值模拟分析.结果表明,三阶段损伤诊断法能有效诊断大跨空间结构的损伤.

Simulated analyses of seismic damage diagnosis on the steel roof structure of National Stadium

In order to diagnose the damage of long-span spatial steel structures,a three-stage damage diagnosis approach was proposed.In three stages,the potentially damaged regions,potentially damaged elements,and damage severity were successively determined.A flexibility-matrix-based damage index FDI(flexibility difference index)was developed to determine damage regions,the damage locating vectors method was utilized to locate damaged elements,and the second-order eigensensitivity analysis was employed to estimate the damage severity.Then according to the results of elasto-plastic time history analyses of the steel roof structure of National Stadium,three damage patterns were simulated.Furthermore,numerical simulated analyses of damage diagnosis of the steel roof structure of National Stadium was carried out.The result showed that the three-stage damage diagnosis approach could effectively diagnose the seismic damage of long-span spatial structures.