火灾作用下钢框架结构连续倒塌数值分析  

Numerical analysis on progressive collapse of steel frame structures under fire conditions

作　　者：钟波 张首飞 吕杨 张学杰 ZHONG Bo;ZHANG Shoufei;LÜYang;ZHANG Xuejie(Sichuan Fire Research Institute of MEM,Chengdu 610036,China;China Nuclear Power Engineering Co.,Ltd Zhengzhou Branch,Zhengzhou 450052,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin 300384,China)

机构地区：[1]应急管理部四川消防研究所,成都610036 [2]中国核电工程有限公司郑州分公司,郑州450052 [3]天津城建大学土木工程学院,天津300384 [4]天津市土木建筑结构防护与加固重点实验室,天津300384

出　　处：《建筑结构》2024年第23期43-49,12,共8页Building Structure

基　　金：国家自然科学基金(51808129、52178295);应急管理部消防救援局科技计划项目(2020XFZD14)。

摘　　要：应用基于分层壳单元的钢筋混凝土楼板和基于纤维单元的梁柱构件火灾响应分析方法,对火灾作用下钢框架结构连续倒塌进行了数值分析,并与已有钢筋混凝土楼板、钢柱以及平面钢框架试验结果进行了对比。结果表明:该方法可以准确模拟钢筋混凝土楼板和梁柱构件的火灾响应。在此基础上,对某8层钢框架结构的从火灾发生到倒塌的全过程进行了数值模拟研究,分析对比了不同火灾工况下钢框架结构的倒塌行为,研究了不同防火保护时长和受火位置对钢框架竖向位移分布和破坏模式的影响,并对比了拆柱法模拟结果。结果表明:所用数值模拟方法获得的模拟结果更贴近钢框架结构真实倒塌情况。The numerical analysis of progressive collapse of steel frame structures under fire conditions was carried out by using the fire response analysis method of reinforced concrete floor based on layered shell element,beam and column component based on fiber element,and compared with the existing test results of reinforced concrete floor,steel column and plane steel frame.The results show that this method can accurately simulate the fire response of reinforced concrete floor,beam and column components.On this basis,the numerical simulation of the whole process from fire to collapse of an 8-story steel frame structure was carried out.The collapse behavior of steel frame structure under different fire conditions was analyzed and compared.The influence of different fire protection time and fire location on the vertical displacement distribution and failure mode of steel frame was studied,and the simulation results of column removal method were compared.The results show that the simulation results obtained by the numerical simulation method are closer to the actual collapse of the steel frame structure.

关 键 词：火灾工况 钢框架 连续倒塌 拆柱法 破坏模式 

分 类 号：TU391[建筑科学—结构工程]