铁路枢纽单层编织拱壳屋盖连续倒塌分析研究  

PROGRESSIVE COLLAPSE ANALYSIS OF SINGLE-LAYER BRAIDED ARCHED-SHELL ROOF OF A LARGE RAILWAY STATION

作　　者：田承昊[1] 刘明[1] 董城[1] Tian Chenghao Liu Ming Dong Cheng(The Third Survey and Design Institute of China Railway, Tianjin 300250, Chin)

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300250

出　　处：《工业建筑》2016年第12期134-139,共6页Industrial Construction

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结构抗连续倒塌的动力分析。利用应力比法分析了站房结构屋盖的重要构件,采用有限元程序ABAQUS对结构进行非线性动力分析,构件破坏判断标准参考美国标准UFC4-023-03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。The key issues of dynamic analysis for large span steel structure to anti-progressive collapse were studied in this research. The use of equivalent load transient unloading method for anti-progressive collapse of the structure dynamic analysis was introduced. The accuracy of applying equivalent load transient unloading to anti-progressive collapse analysis depends on the load-time history curve. ABAQUS was used to do the nonlinear analysis of the structure,and the criterion of component failure was based on the requirements of UFC 4- 023- 03. This paper introduced the load carrying capacity and deformation acceptance criteria of anti-progressive collapse dynamic analysis based on practical engineering example and determined if the load carrying capacity and deformation exceeded limits after the key structural component failure. The analysis results showed that the progressive collapse resisting capacity of steel structures could be remarkably improved by increasing the failure strain of the structural material.

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 

分 类 号：TU399[建筑科学—结构工程] TU312.3