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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。
In order to reduce the possibility of continuous structural collapse caused by the failure of local components, the dynamic analysis of anti-collapse of the structure under the condition of different supports failure is carried out by using the equivalent load instantaneous unloading method. The stress-ratio method is used to analyze the important components of the roof of the station building structure. The finite element program ABAQUS is used to analyze the nonlinear dynamic analysis of the structure. The standard of component failure judgment refers to the requirements of the American Standard UFC4-023-03. The bearing capacity and deformation criterion of anti-continuous collapse analysis are introduced to analyze whether the stress ratio and deformation of the structure can meet the design requirements. The results show that local failure of the roof occurs at different positions, but the failure is limited within a certain range around the removal member. In the case of failure of the side support, the failure range of the structure obviously increases, but the final failure Limit to the local scope, will not cause the continuous collapse of the overall structure.