网壳结构基于性能的动力失效判定准则

Judging criterion of dynamic failure in latticed shells based on performance

基于性能的设计思想,文章提出了一种网壳结构震后是否发生动力失效的判定准则。按常规设计的网壳结构遭遇地震后,保留残余应变的状态并作为初始状态重新进行常规设计,如果此时网壳结构已不能满足初始设计时所要求的各项性能,则认为网壳结构已发生动力失效;进而将网壳结构的动力失效形式分为Ⅱ类,该文提出的准则用于判定第Ⅱ类动力失效,称为第Ⅱ类失效准则;算例分析表明,该准则判别结果明确,便于工程实践的应用。

A judging criterion of dynamic failure is proposed based on the ideology of performance-based design. To the latticed shells which were designed according to the usual procedure and suffered the strong seism, the remaining state in which the latticed shell kept the residual strain is used as the initial state of redesign according to the usual procedure. If the output maximum displacement under all loading combinations exceeds the allowed displacement, the structure is judged to be in dynamic failure under the strong seism. The dynamic failure is divided into two kinds and the judging criterion proposed in this paper is suitable to the second kind and is called the second failure criterion. The results of an example show that the second failure criterion can provide an explicit judging result and is convenient for application in practical engineering.