火灾下钢框架耐火极限有限元分析

Finite Element Analysis of Fire Resistance of Steel Frames under Fire

本文应用有限元软件ABAQUS,建立一个三层三跨钢框架模型,对六个受火房间在火灾下的温度场、结构变形进行研究,得到结构耐火时间和临界温度。依据结构或构件失效标准可知:一层中跨耐火时间最短,三层边跨耐火时间最长,受火期间梁均先于柱破坏,应适当加强一层中跨以及梁防火保护。该结果可为钢结构抗火设计提供参考。

In this paper,a three story and three span steel frame model is established by using the finite element software ABAQUS.The temperature field and deformation of six fire rooms under fire are studied,and the fire resistance time and critical temperature of the structure are obtained.According to the structural or component failure criteria,it is known that the fireproof time of the middle span is the shortest,the three layer side span has the longest fire-resistant time,and all beams fail before columns during the fire,so it is necessary to strengthen the fire protection measures of the one layer middle span and the beam.The results can provide reference for the fireresistant design of steel structure.