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为了研究既有地铁车站发生火灾时,其混凝土主体结构中温度的变化情况,以某地铁站主体结构为对象,使用FLAC3D对该地铁站进行了模拟,构建了火源产生的除混凝土结构外的热对流和热辐射叠加温度场。根据温度不同材料性质不同的现象,在模拟过程中随温度升高实时调整材料参数,使模拟结果更加准确。模拟了从4℃到1000℃期间的3个设定位置火源使结构温度场的变化。结果表明:在定量角度,车站各部分温度变化与火源温度变化存在一定的数值关系;定性得到,结构越连续,空间刚度越大,热能在车站混凝土结构中传播越快,温度分布越均匀。对该地铁站提出了一些应重点防护的位置。
In order to study the temperature change of the concrete main structure in the case of a fire in an existing metro station, this subway station was simulated with FLAC3D and the main structure of a metro station was simulated. Thermal convection and thermal radiation superimpose the temperature field. According to the phenomena of different material properties in temperature, the material parameters are adjusted in real time with the increase of temperature in the simulation process to make the simulation results more accurate. The change of structure temperature field was simulated from three set positions of ignition source from 4 ℃ to 1000 ℃. The results show that there is a certain numerical relationship between the temperature change of each part of station and the change of fire source temperature. Qualitatively, the more continuous the structure and the larger the space stiffness, the faster the thermal energy propagates in the station concrete structure and the more uniform the temperature distribution. The subway station put forward some should focus on the protection of the location.