基于子结构的钢框架结构抗连续倒塌性能快速评估方法

发布时间：2018-08-26 15:19

【摘要】：目前常用于建筑结构抗连续倒塌性能评估的替代传力路径法由于需要建立复杂的结构整体模型,计算效率低。基于此,将子结构法与替代传力路径法相结合,建立钢框架结构抗连续倒塌性能快速评估方法。首先给出钢框架结构容许倒塌范围,并据此建立子结构的选取原则;基于固定界面模态综合法,提出子结构边界条件的模拟方法;最后给出钢框架结构连续倒塌判定准则,在子结构抗连续倒塌性能分析的基础上,建立整体结构抗连续倒塌性能评估方法。以2个5层钢框架结构为例,分别采用替代传力路径法与所提出方法对其进行抗连续倒塌性能分析。结果表明:所提出的方法计算结果可靠,且能显著提高计算效率,可实现对整体结构抗连续倒塌性能的快速评估。
[Abstract]:At present, the alternative load transfer path method, which is often used to evaluate the continuous collapse resistance of building structures, has low computational efficiency because of the need to establish a complex structural integral model. Based on this, a rapid evaluation method for continuous collapse resistance of steel frame structures is established by combining substructure method with alternative force transfer path method. Firstly, the allowable collapse range of steel frame structure is given, and the selection principle of substructure is established. Based on the fixed interface modal synthesis method, the simulation method of substructure boundary conditions is proposed. Finally, the criterion of continuous collapse of steel frame structure is given. Based on the analysis of continuous collapse resistance of substructures, an evaluation method for continuous collapse resistance of whole structures is established. Taking two five-story steel frame structures as examples, the method of alternative force transfer path and the proposed method are used to analyze the continuous collapse resistance of the structures. The results show that the proposed method is reliable and can significantly improve the efficiency of calculation, and can realize the rapid evaluation of the anti-collapse performance of the whole structure.
【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家“十二五”科技支撑计划项目(2012BAJ07B05) 国家自然科学基金项目(51238007,51178306,51008209)
【分类号】：TU391

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