长江防洪模型大厅结构损伤免疫力及换索分析

Damage immunity analysis and changing cable analysis on structure of Changjiang River Model Hall

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 damage immunity of space grid structure is the ability of preventing the structural progressive collapse when local member or joint fails.Through the damage immunity analysis on the structure of Changjiang River Model Hall,the progressive damage area of structure is found out under the conditions of different local failure.The results show that the damage immunity of mid-span and support is small,and the damage of these members and joints at the main load-transferred path could lead to some progressive damage,so these positions are the weak regions of the structure.The methods can improve the system reliability based on the analysis results.