大跨度钢结构站房抗连续倒塌动力分析

Dynamic Analysis for Anti- progressive Collapse of Large Span Steel Structure in Station Building

研究目的:新型大型铁路客站是大型的建筑联合体,具有较大的政治影响,在遭遇非预期荷载作用并因局部失效诱致整体结构发生连续性倒塌时,会造成大量的人员伤亡和巨大的财产损失。本文采用有限元程序LS-DYNA,针对天津西综合交通枢纽中央站房轨道层以上结构体系进行非线性动力分析,探究结构在防止连续倒塌方面的薄弱环节,为运营期间的维护和类似建筑的设计提供指导与参考。研究结论:(1)在不同位置单柱失效情况下,结构发生局部破坏并产生较大位移,但破坏只集中在特定的局部区域,没有扩散;(2)在双柱失效情况下,结构破坏范围明显加大,但最终破坏仍限制在局部范围,不会造成整体结构的连续倒塌;(3)结构具有很好的冗余度及防止连续倒塌的能力;(4)等效荷载瞬时卸载法简单有效,可应用于大跨度钢结构站房的连续倒塌分析。

Research purposes： The new large railway passenger station is a large building complex, which has great political influence. In case of any unexpected loads and the overall structure % progressive collapse induced by local failure, it causes a large number of casualties and huge property losses. This paper used the finite element program LS - DYNA, carried out the nonlinear dynamic analysis for the central station structure system of Tianjin West comprehensive transportation junction, and explored the weak link of structure to prevent the progressive collapse, to provide guidance and reference for maintenance during operation and the design of similar structures. Research conclusions：（ 1 ） This station structure is locally damaged column failure cases, but the damage is confined within the limited and the larger displacement appears for single - area around the removed member. （2） For the double -columns failure case, the damaged area is obviously increased, but the damage is still confined in a limited area and wont induce the whole structure＇s progressive collapse. collapse. （4） The instantaneous component -removing method progressive collapse of large span steel structure in station. （3） The structure has strong ability to resist progressive is simple and useful, and can be used in the analysis of