东南大学学报（英文版）2023，Vol.39Issue(4)：361-371,11.DOI:10.3969/j.issn.1003-7985.2023.04.005
基于高温组件模型的火灾下钢框架结构连续倒塌分析
Progressive collapse analysis of steel frames under fire based on high-temperature component model
摘要
Abstract
To explore the overall behavior response and progressive collapse mechanism of steel frame structures under fire,a progressive collapse test was conducted on a 1∶2 scale steel frame structure with a corner room subjected to fire.Consequently,the air temperature-time,component temperature-time,and frame displacement-time curves of the entire fire development process,as well as the progressive collapse failure mode of steel frame structures under fire,were obtained.A high-temperature component model of welded flange-bolted web connections was established using the component method,and a bilinear mathematical model for the moment-rotation angle curves of welded flange-bolted web connections at high temperatures was derived.On this basis,a finite element analysis model was established for the progressive collapse of steel frame structures under fire,including the high-temperature component model of welded flange-bolted web connections.The accuracy of the finite element analysis model was verified by comparison with the progressive collapse test results,and the progressive collapse mechanism of steel frame structures under fire was revealed.The results show that under fire within the corner room of a steel frame structure,even though the stress ratio of the corner column is the lowest,primarily due to its lower axial constraint than the inner and side columns,the corner column will first lose its load-bearing capacity and withdraw from work.This triggers the progressive collapse failure of the steel frame structure.关键词
火灾/组件模型/栓焊节点/连续倒塌/钢框架Key words
fire/component model/welded flange-bolted web connection/progressive collapse/steel frame分类
建筑与水利引用本文复制引用
丁润民,范圣刚..基于高温组件模型的火灾下钢框架结构连续倒塌分析[J].东南大学学报（英文版）,2023,39(4):361-371,11.基金项目
The National Natural Science Foundation of China(No.52278153,51878146),Scientific Research Foundation of Gradu-ate School of Southeast University. （No.52278153,51878146）
