某Z字形连廊结构抗连续倒塌性能评估

Evaluation of anti-progressive collapse performance of a Z-shaped corridor structure

以某Z字形连廊结构为研究对象,采用拆除构件法评估了该结构的抗连续倒塌性能。基于SAP2000程序,建立其有限元模型。通过基于节点位移的敏感性分析确定该连廊的关键构件。基于考虑初始状态的等效荷载瞬时加载法对连廊结构进行抗连续倒塌分析,采用规范建议的准则评估其抗连续倒塌性能。结果表明:对于该Z字形连廊结构,转角处或跨中处的柱被拆除时,结构位移响应较其他位置柱拆除时变化更为明显,可确定其为关键构件;在关键构件被拆除的情况下,剩余结构的水平钢梁梁端转角均未超过限值,结构未发生连续倒塌;该连廊结构设计较为合理,具有良好的抗连续倒塌性能;增加一定数量的斜撑后,其抗连续倒塌能力可得到增强。

Taking a Z-shaped corridor structure as the research object,the anti-progressive collapse performance of the structure was evaluated by the method of removing the components.Based on SAP2000 program,the finite element model was established.The key components of the corridor were determined by sensitivity analysis based on node displacement.The equivalent instantaneous loading method based on initial state was used to analyze the anti-progressive collapse of the corridor structure,and the anti-progressive collapse performance of the corridor structure was evaluated by the recommended criteria of the code.The results show that for the Z-shaped corridor structure,when the column at the corner or mid-span is removed,the structural displacement response changes more significantly than that when the column at other positions is removed,and it can be determined that it is the key component.When the key components are removed,the beam end corners of the horizontal steel beams of the remaining structure do not exceed the limit,the structure does not occurred the progressive collapse.the structure design of the corridor is relatively reasonable,and has a good anti-progressive collapse performance.With the addition of a certain number of slant bracings,its anti-progressive collapse performance can be enhanced.