中文摘要：

采用变换荷载路径法,对某大跨度双层球面网壳结构进行双重非线性屈曲及强度分析,研究其抗连续倒塌性能,并根据失稳及强度破坏准则探讨大跨度双层球面网壳结构连续倒塌的失效机理.研究表明,双层球面网壳结构冗余度较高,在使用荷载作用下结构8个节点的严重局部破坏都未引发其连续倒塌,本文中的双层网壳结构直到受到3倍左右使用荷载时才发生连续倒塌破坏;通过不断加大结构所受荷载幅值,发现没有局部破坏的完整大跨度双层球面网壳结构最终倒塌时发生失稳破坏,遭到轻微局部破坏的结构最终倒塌时是失稳和强度破坏的共同作用,遭受严重局部破坏的结构最终倒塌时发生强度破坏.

英文摘要：

Dual nonlinear buckling analysis and strength analysis are conducted to study the resistance to progressive collapse of a large-span double-layer latticed dome based on alternate path （AP） method. Furthermore, progressive collapse mechanism of large-span double-layer latticed dome is explored according to stability and strength failure criteria. Results show that double-layer latticed domes have good redundancy and severe local failure like the damage of 8 nodes of the structure under service loads would not cause progressive collapse. The structure in this paper collapses until its loads increase to about 3 times of the service loads. In addition, when loads on the structure increase, large-span double-layer latticed dome without any local damage has instability failure. Progressive collapse of a structure with minor local damage is a result of both instability failure and strength failure. Progressive collapse of a structure with severe local damage is a result of strength failure.