火灾时隧道临界风速及内力模拟研究  

Critical Wind Velocity and Internal Force Simulation of Tunnel Fire

作　　者：王星星[1] 徐龙[1] 廖光明[1] 刘恩德[1] 罗鼎元 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2013年第S1期13-17,共5页Journal of Sichuan University (Engineering Science Edition)

摘　　要：火灾时的烟气控制在隧道防火安全设计中占有很重要的地位,而临界风速即隧道火灾过程中能有效控制烟气于火源下风方向而不发生逆流的最小纵向风速,是隧道火灾烟气控制的关键。利用CFD数值模拟软件对公路隧道不同火灾工况的烟气扩散进行了数值模拟,并运用SAP2000分别计算了火灾时不同火源位置不同临界风速下钢筋混凝土隧道的内力大小。经过对比分析得出,适当增大其临界风速可有效地控制烟气流的扩散避免产生回流,同时也有利于减小高温下隧道结构损伤。The CFD numerical simulation software was used to simulate the smoke diffusion of different fire conditions of the road tunnels,and the internal force of the reinforced concrete tunnel in different critical wind velocity and different fire source locations was calculated by using SAP2000.The comparative analysis showed that it should be appropriate to increase the critical wind velocity,so that it can effectively control the spread of the flue gas flow to avoid reflux,and it is also beneficial to reduce the tunnel structural damage in the condition of high temperature at the same time.

关 键 词：临界风速 隧道火灾 隧道衬砌 温度应力 结构损伤 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]