某大楼在撞击荷载下的抗连续倒塌分析

Anti-progressive Collapse Analysis of a Building under Impact Load

本文运用有限元模型,采用直接去柱和撞击去柱两种方法,模拟俄亥俄州立大学综合大楼拆除底层中柱的过程,对俄亥俄州立大学综合大楼的抗连续倒塌机制进行了分析,从而证明多层框架结构简化模型的合理性。通过对直接去柱法和撞击去柱法的对比,结果表明:用直接去柱法拆除中柱后,经过一段时间振荡最后达到平衡;而用撞击去柱法拆除中柱后,撞击点及正上方节点受到较大破坏。由此得知,抗连续倒塌研究应该结合具体灾害进一步分析,避免直接去柱法低估灾害对结构的影响。

The fi nite element model was used to simulate the process of demolishing the bottom middle column of the Ohio State University by means of direct column removal and impact column removal,and the anti-progressive collapse mechanism of the Ohio State University was analyzed,so as to prove the rationality of the simplifi ed model of multi-storey frame structure.Through the comparison between the direct column removal method and the impact column removal method,the results show that:the equilibrium is fi nally reached after a period of oscillation by the direct column removal method;the impingement point and the node directly above are damaged greatly when the middle column is removed by impingement.It is concluded that the study of progressive collapse resistance should be further analyzed in combination with specifi c disasters to avoid underestimating the impact of disasters on structures by direct column removal method.