为了给波纹钢综合管廊的防火设计提供参考数据,研究了火灾下波纹钢综合管廊的损伤、变形的规律。基于FDS软件,建立了圆形波纹钢综合管廊电力舱的火灾动力学模型,模拟得到了在灭火系统失效的情况下圆形波纹钢综合管廊火灾时舱室内温度演化规律。结果表明:电缆发生火灾时火灾迅速向上蔓延,最高温度可达1 000 ℃以上,火灾可持续20~25 min。在此基础上,利用通用有限元软件ABAQUS建立了波纹钢综合管廊的温度-应力耦合模型,输入FDS模拟得到的温度边界,并且综合考虑了温度对波纹钢的各种材料特性的影响,模拟得到了波纹钢综合管廊火灾下结构力学特性。结果表明:波纹钢在火灾下温度会迅速升高,弹性模量和强度随之降低;在火灾持续燃烧4~5 min时,综合管廊电力舱的地面和中隔墙处的角部首先出现屈服;在7 min左右,波纹钢的承载力开始显著降低,随后钢结构变形快速发展直至完全破坏,尤其是舱室的腰部产生的水平位移较大;伴随着衬砌结构的屈服破坏,管廊上方的路面也出现了较大的沉降位移。
In order to provide reference data for the fire protection design of corrugated steel utility tunnels, the damage and deformation laws of a corrugated steel utility tunnel under fire were studied. Based on FDS software, the fire dynamic model of the power compartment of the circular corrugated steel utility tunnel was established, and the temperature evolution of the compartment in the case when the fire extinguishing system fails was obtained. The results show that when the cable fire occurs, the fire spreads upward rapidly, and the maximum temperature can reach 1 000 ℃. And the fire can last for 20~ 25 min. On this basis, the general finite element software ABAQUS is used to establish the thermal-mechanical coupled model of corrugated steel utility tunnel. The temperature boundary obtained by FDS simulation is input, and the influence of temperature on various material properties of corrugated steel is considered comprehensively. The structural mechanical properties of corrugated steel utility tunnel under fire are simulated. The results show that the temperature of corrugated steel increases rapidly, and the elastic modulus and strength decrease accordingly. When the fire continues to burn for 4 ~ 5 min, the corner of the inner ground and the middle partition wall of the power compartment of the utility tunnel will yield first. At about 7 minutes, the bearing capacity of the steel structure decreases rapidly, and then the deformation of the steel structure developed rapidly until it was completely destroyed Especially, the horizontal displacement of the tunnel waist was large. Along with the yield failure of lining structure, the pavement above the utility tunnel also appears large settlement displacement.
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