基于BIM的地铁站台火灾防排烟模式研究

Research on fire prevention and smoke exhaust mode of subway platform based on BIM

利用BIM技术,依靠Revit建立地铁车站三维物理模型,导入Pyrosim转化为火灾模型,模拟地铁车站火灾。针对地铁车站站台不同的起火位置,测定三种通风模式下的排烟效果,分析站台起火时烟气的扩散规律、人眼高度处CO体积分数、能见度、火源位置附近的温度场、以及楼扶梯口速度场的变化。结果表明,采取站台主风机排烟,辅助风机一推一拉模式可有效抑制站台温度的升高,相对于只采用站台主风机排烟,站台温度下降13.2%,CO体积分数下降42%,相对于自然排风模式,站台温度降低45.9%,CO体积分数降低48.5%。

Based on BIM technology,a three-dimensional physical model of subway station was built by Revit,and then imported into Pyrosimto be translated into fire model to simulate subway station fire.According to the different fire position of subway station plat-form,the smoke exhaust effect under 3 different ventilation modes was set to analyze the diffusion law of smoke,the concentration of CO at the human eye level,visibility,the temperature field near the fire source,and the change of the speed field of the stairway es-calator.The results showed that:using the platform main fan ex-haustion,the auxiliary fan one push-pull mode can effectively in-hibit the platform temperature increase;compared to the use of the station main fan exhaust,the platform temperature decreased by 13.2%,CO concentration decreased by 42%,compared to the natu-ral exhaust mode,the platform temperature dropped by 45.9%and the carbon monoxide concentration decreased by 48.5%.