论文部分内容阅读
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-scale railway passenger station is a large-scale construction complex that has a large political impact. When an unplanned load is encountered and the entire structure collapses due to a partial failure, it will cause a large number of casualties and huge assets loss. In this paper, finite element program LS-DYNA is used to conduct nonlinear dynamic analysis of the structure above the rail track at the Central Station of Tianjin West Comprehensive Transportation Hub to explore the structural weaknesses in the prevention of continuous collapse for the maintenance during operation and the design of similar buildings Provide guidance and reference. The conclusions are as follows: (1) Under the condition of single-column failure in different positions, the structure is locally damaged and has a large displacement, but the damage is concentrated only in a specific local area without diffusion. (2) In the case of double-column failure, The range is obviously increased, but eventually the damage is still limited to the local scope, which will not cause the continuous collapse of the whole structure. (3) The structure has good redundancy and the ability to prevent continuous collapse. (4) The equivalent load instantaneous unloading method Simple and effective, it can be applied to continuous collapse analysis of long-span steel structure station buildings.