网壳结构失效机理研究现状

OVERVIEW OF THE FAILURE MECHANISM FOR RETICULATED DOMES

网壳结构的倒塌模式及失效机理研究一直是土木工程界研究的热点。对国内外网壳结构在静力和动力作用下的失效机理研究现状进行了总结和归纳。通过非线性有限元分析,能够精确模拟网壳结构在静力作用下的失效模式及极限承载力;通过动力时程分析,能够模拟网壳结构在特定动力荷载作用下的失效模式,对网壳结构失效模式判别的方法进行了评述,提出了建议从鲁棒性、易损性、冗余度及连续倒塌等多个方面进行深入探讨,建立一个合理的网壳失效判别准则。

The rescearch on the collapse mode and failure mechanism for reticulated domes is always the research hotspot in the civil engineering field. The present research achievements of the failure mechanism of reticulated shells under static and dynamic actions are assummarized. It can be simulated that the failure mode and bearing capacity of reticulated shells subjected to static actions through nonlinear finite element analysis. The collapse mode of reticulated shells under specific dynamic action can be obtained through dynamic time history analysis. The judging criteria of the collapse scenarios are discussed. It is proposed that a reasonable failure criterion can be established from other aspects such as the robustness,the vulnerability,the redundancy and the progressive collapse.