某大跨度可开合空间网架屋盖连续倒塌分析

Progressive Collapse Analysis for A Large Span Openable Truss Roof

针对某大跨度可开合空间网架屋盖,分析其在17级台风荷载作用下的抗连续倒塌性能。采用构件拆除法,分别拆除结构敏感性最高的单根、前6根及前10根杆件,按一阶屈曲模态分布考虑初始缺陷的影响,通过结构极限承载力的变化来评估拆除杆件后是否会引发其连续倒塌。结果表明,结构在17级台风作用下开合屋盖结构单根构件失效后仍然拥有较高的冗余度,当拆除屋盖敏感性最高的前十根杆件后,不会引发屋盖的连续倒塌。

Progressive collapse resistance of a large span openable truss roof is analyzed under the action of the 17th typhoon.Using the component removal method,the first single,six and ten members with the highest structural sensitivity were removed,and the change in the ultimate bearing capacity of the structure was used to evaluate whether the structure would cause progressive collapse consider the influence of initial imperfections according to the first-order buckling mode distribution.The results show that the structure still has a high degree of redundancy after the failure of a single member of the openable roof structure under the action of the 17th typhoon.When the 10 key members of the structure are removed,progressive collapse of openable roof will not happen.