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研究目的:大型交通枢纽的空间体量大、覆盖范围广,因而在遭遇偶然荷载作用并因局部失效诱致整体结构发生连续性倒塌时,会造成大量的人员伤亡和巨大的财产损失,应对其进行抗连续倒塌分析。为研究结构连续倒塌的全过程,采用瞬时加载法和大变形动力有限元软件LS-DYNA,对某大型站房进行2个单柱失效和1个双柱失效情况下的结构连续倒塌分析,构件破坏判断标准参考美国国防部规范UFC 4-023-03的要求。研究结论:分析结果表明:(1)在不同位置单柱失效情况下,该站房结构发生了局部破坏,但破坏限制在去除构件周围的一定范围内;(2)在双柱失效情况下,结构破坏范围明显加大,但最终破坏仍限制在局部范围内,不会造成整体结构的连续坍塌,结构具有较强的抗连续倒塌能力;(3)对于钢结构,提高材料的失效应变可以显著提高结构抵抗连续倒塌的能力;(4)该研究成果可为类似结构的安全性评价提供一种简便的尺度。
Research purposes: Large-scale transport hubs have a large space and a large area of coverage. Therefore, when accidental loads are applied and the entire structure collapses continuously due to the partial failure, a large number of casualties and huge property losses will be caused, which should be carried out Anti-continuous collapse analysis. In order to study the whole process of continuous structural collapse, the transient loading method and large deformation dynamic finite element software LS-DYNA were used to analyze the continuous collapse of a large station with two single columns failure and one double column failure. Refer to the requirements of the United States Department of Defense specification UFC 4-023-03 for the criterion of damage judgment. Research conclusions: The results of the analysis show that: (1) Under the condition of single-column failure in different positions, local failure of the station structure occurs, but the damage is limited within a certain range around the removed components; (2) The range of structural failure is obviously increased, but the ultimate failure is still limited to the local scope, which will not cause the continuous collapse of the whole structure and the structure has a strong ability of continuous collapse. (3) For steel structures, Improve the ability of the structure to resist continuous collapse; (4) The research results can provide a simple and convenient scale for the safety evaluation of similar structures.