防火玻璃窗耐火性能数值模拟

Numerical Simulation on Fire Behavior of Fire-rated Glass Windows

目的计算火灾过程中防火玻璃窗在不同力学约束条件下的耐火时间,提出防火窗中玻璃的合理安装方式,确定防火玻璃窗在抑制建筑火灾纵向蔓延中的作用.方法首先使用FDS软件,计算火场内升温曲线;然后使用ANSYS软件,分析预定火灾场景下防火玻璃内的温度场,计算防火玻璃在四种不同的力学边界约束下的应力分布和单元失效过程.结果防火玻璃温度场出现"边框现象",且防火玻璃在四边固定、两边固定两边自由、三边固定一边自由以及四点固定耐火时间为1 113 s、1 051 s、983 s、1 531 s.结论四点固定防火玻璃窗在火灾下应力分布合理,耐火时间长,是合理的安装方式.

This paper was proposed to investigate the reasonable installation mode of the glass in the fire-rated window, and determine the role of the fireproof glass window in suppressing the lon- gitudinal spread of the building fire by calculating the fire resistance time of the fireproof glass window under different mechanical constraints. First, the FDS software was used to calculate the temperature rise curves. Then, the ANSYS software was used to analyze the temperature field of the fire glass in the fire scene and calculate the stress distribution and the failure process of the fire- proof glass under four different mechanical boundary constraints. Fireproof glass temperature field appears ＂border phenomenon＂, and the fire rated time under the conditions of four sides fixed, two sides fixed and two sides free, three sides fixed and one sides free, and four points fixed were 1113 s, 1051 s ,983 s, and 1531 s respectively. All the results demonstrated that stress distribution in fire rated glass fixed at four points is the most suitable installation method with longer fire resistant time.