摘要
研究目的:本文以某站房大跨单层编织网壳为对象,利用ANSYS有限元分析软件,对其进行抗连续倒塌分析。基于平均应力比的概念,根据柱子的应力大小,确定关键柱子。应用线弹性静力分析和非线性静力分析两种方法,对结构在单根关键柱失效的情况下的剩余结构进行连续倒塌分析。通过对比两种方法,从而探索此类大型公共建筑防止连续倒塌的更精确计算方法。研究结论:(1)采用平均应力比作为结构的移除指标以代替重要性系数的方法方便可行,说明此方法不仅适用于框架结构,也可推广到大跨空间结构;(2)静力分析方法比动力分析方法方便可行,但可能会导致更保守的结果;(3)边拱柱子失效后,边拱局部区域发生破坏,发生很大的位移及杆件转角,构件内力发生重分布,这说明边拱柱子是结构的重要部位,在使用过程中应重点防护;(4)拱顶接近悬挑端中部有部分杆件出现断裂情况,但没有大面积扩散,在实际设计中应对此部分进行重点防护;(5)本研究揭示的建筑连续倒塌的机制与模式,可用于大型车站建筑防爆抗爆及设计。
Research purposes： Taking a long - span single - layer latticed shell station for weaving, by using the ANSYS finite element analysis software, this paper analyzes anti progressive collapse. Based on the concept of average stress ratio, according to the size of column stress, the key columns are determined. The two kinds of methods of linear elastic static analysis and nonlinear static analysis are applied to progressive collapse analysis of residual structure in the case of the single key column failure. By comparing the two kinds of methods, the more accurate calculation method preventing this kind of large public buildings progressive collapse is explored.
Research conclusions： （ 1 ） The method using the average stress ratio as the removing index of the importance coefficient is feasible which shows that this method is not only suitable for frame structure, but also can be extended to long - span space structure. （2） Static analysis method is more feasible than dynamic analysis method, but may lead to more conservative results. （3） After the failure of the side arch column, side arch local regional failure occurred, large displacement and rotation angle bar appeared. This shows that side arch column is an important part of the structure and should focus on the protection of the side column in the use process. （4） Some bars of vault near central cantilever end rupture, but don＇t spread. So this section should be protected in the actual design. （5） The research result about the mode and mechanism of building continuous collapse, can provide a reference and guidance for the anti - explosion and design of the similar station buildings.
出处
《铁道工程学报》
EI
北大核心
2015年第10期115-119,共5页
Journal of Railway Engineering Society
关键词
单层编织网壳
连续倒塌
平均应力比
线弹性静力分析
非线性静力分析
single - layer braided shell
progressive collapse
average stress ratio
linear elastic static analysis
nonlinear static analysis
