火灾下腹板开孔轻钢龙骨墙体温度场数值模拟分析

Numerical Simulation Analysis of Thermal Distribution of Slotted Light-gauge Steel Stud Walls Exposed to Fire

采用有限元分析软件ABAQUS建立了腹板开孔轻钢龙骨围护墙体温度场分析模型,阐述了模型中的若干关键问题,如受火面与背火面边界条件,石膏板、岩棉和钢材的热工性能参数及材料间的接触条件等,并将模拟结果与相关试验结果进行对比。在此基础上,分析了相关参数对腹板开孔轻钢龙骨墙体背火面的最高温度和平均温度的影响规律。结果表明:该模型可有效模拟该类墙体在火灾下的温度分布;龙骨截面高度与石膏板层数及布置方式均可在较大程度上影响墙体背火面的最高温度与平均温度;腹板开孔排数只对背火面最高温度影响较大,对平均温度则影响不大。

A heat transferring analysis model of thermal distribution of slotted light-gauge steel stud was developed using finite element analysis software ABAQUS to investigate some key issues of the wall exposed to fire,such as the boundary conditions of the exposed side and unexposed side,thermal properties of gypsum board,rock wool and steel,as well as the interactive property parameters between different materials.Comparisons between the simulation results and the related experimental data were done.Based on this,the parametric study was then conducted to investigate their influence on the maximum temperature and average temperature of the walls on the unexposed side.The results show that the finite element model can effectively simulate the temperature distribution of the wall elements exposed to fire.Sectional heights of the studs,the layer of gypsum boards and their arrangement have considerable influence on the maximum temperature and the average temperature of the walls on the unexposed side.Whilst the row number of slots on web only considerably affect the maximum temperature of the walls on the unexposed side but barely affect their average values.