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将空间网格结构在局部破坏的情况下抗连续性倒塌的能力定义为空间网格结构损伤免疫力。通过对长江防洪模型大厅拱支预应力网架结构的损伤免疫力分析,查明该结构在各种局部损伤情况下所产生的相继破坏的范围。分析结果表明,跨中上下弦杆、跨中节点、支座节点等处于主要传力路径上的构件或节点损伤免疫力相对较小,失效后将产生一定范围的相继破坏,这些部位是结构的薄弱环节。分析为以最小代价提高该结构体系的可靠度提供了指导。
The ability of a space grid structure to collapse in the event of a partial failure is defined as the damage immunity of the space grid structure. By analyzing the damage immunity of the prestressed arch structure of arch bridge in the Yangtze River Flood Control Model Hall, the range of successive damage caused by various local damage of the structure was found out. The analysis results show that the components or nodes in the main force transmission path across the middle, upper and lower chords, mid-span nodes and bearing nodes have relatively small damage immunity, and will have a range of successive damage after failure. These parts are structural weakness. The analysis provides guidance for improving the reliability of the structural system with minimum cost.