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在近年来国内外数起网格结构倒塌事故发生后,结构体系局部发生破坏后对整体结构的影响程度愈来愈受到结构工程师的关注。以广东科学中心空间网壳结构为实际工程背景,应用了网格结构损伤免疫力的概念,提出了网格结构进行损伤免疫力分析的两种方法。利用基于等效杆件撤销的结构重分析方法,编程实现了对网格结构损伤免疫力的定量评估。利用非线性静力分析方法对网壳结构在局部构件破坏后的抗倒塌性能进行了分析。分析结果表明,损伤免疫力大小反映了结构的内力调整能力和结构体系内部的薄弱环节,网壳结构整体损伤免疫力较好,不会出现局部杆件或节点破坏导致结构整体倒塌的情况。
In recent years, several domestic and international grid structure collapse accident occurred, the partial structural system damage occurred after the impact on the overall structure more and more by structural engineers. Based on the space grid shell structure of Guangdong Science Center as the practical engineering background, the concept of damage immunity of grid structure was applied and two methods of grid structure damage immunity analysis were proposed. Using the method of structural reanalysis based on the equivalent rod withdrawal, a quantitative assessment of the damage immunity of the lattice structure has been programmed. The non-linear static analysis method is used to analyze the anti-collapse performance of the lattice shell structure after the failure of local components. The results show that the size of the damage immunity reflects the internal force adjustment ability of the structure and the weak links inside the structure system, and the overall damage immunity of the reticulated shell structure is good, so that the whole structure will not collapse due to local bar or node destruction.