（中国铁路设计集团有限公司， 天津 300250）

［摘要］为减少局部构件破坏引起结构连续倒塌的可能性,运用等效荷载瞬时卸载法对一综合交通枢纽中央站房屋盖进行了不同支座失效情况下的结构抗连续倒塌动力分析。利用应力比法分析站房结构屋盖的重要构件，采用ABAQUS软件对结构进行非线性动力分析，构件破坏判断标准参考美国规范的要求。介绍抗连续倒塌动力分析的承载力和变形判定准则，分析在关键构件失效瞬间结构的应力比和变形能否满足设计要求。结果表明，在不同位置支座失效的情况下,该屋盖发生了局部破坏，但破坏限制在去除构件周围的一定范围内;边支座失效情况下，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坍塌。

［关键词］单层编织拱壳； 抗连续倒塌； 瞬时卸载法； 动力分析； 等效荷载

中图分类号：TU323文献标识码：A文章编号：1002-848X(2018)11-0064-06

Progressive collapse analysis of large-span single-layer braided arched-shell

Tian Chenghao, Liu Ming, Dong Cheng

(China Railway Design Corporcation, Tianjin 300250, China)

Abstract:In order to reduce the possibility of structural progressive collapse caused by the failure of local components, the equivalent load transient unloading method was used to conduct anti-progressive collapse dynamic analysis on building roof for central station of an integrated transportation hub under the condition of different supports failure. Stress ratio method was used to analyze the key components of the roof of the station building structure, and the nonlinear dynamic analysis of the structure was carried out by using ABAQUS software. The standards of component failure judgment referred to the requirements of the U.S. code. The bearing capacity and deformation criterion of anti-continuous collapse analysis were introduced to analyze whether the stress ratio and deformation of the structure could meet the design requirements. The results show that local failure occurs in the roof under the condition of different supports failure, but the failure is limited to a certain range around the removal members. In the case of failure of the side support, the failure range of the structure obviously increases, but the final failure is still limited to the local scope, which will not cause the continuous collapse of the overall structure.

Keywords:single-layer braided arched-shell; anti-progressive collapse; transient unloading method; dynamic analysis; equivalent load

作者简介：田承昊，硕士，工程师，Email:tianchenghao@crdc.com。