Numerical Calculation Research On Performance-based Fire Safety Of Metro

With the high-speed development of Chinese large and medium-sized cities, the urban population increase rapidly. However the traffic becomes congested. The subway as a symbol of modern city could very well alleviate the pressure of the huge traffic. In recently, the subway construction rises so that the subway fire disaster cause more attention by many experts and builders. Once the subway catch on fire, the consequence will be unestimable.This paper based on the performance-based fire protection analysis, through numerical simulation studied the fire smoke flow and safety, personnel safety evacuation and the safety of the tunnel lining structure. The main content is summarized as follows:Analysis the related design and calculation of subway fire smoke control, the time needed for safe evacuation and the tunnel lining structure fire resistance by the existing norms and theory. Put forward the defects of forward design. And using the method of numerical anal ysis, combined with the actual engineering situation, studied the performance-based fire safety of the subway. Mainly includes through the numerical simulation of the actual shield subway tunnel, studied the smoke flow under different fire load. Obtain the critical wind speed and get simple formula by fitting the results. And get the critical wind speed under different curve radius value, found the results is smaller than the one in straight tunnel. Based on the actual subway station fire, got the amount of minimum exhaust which satify the flue gas not spread to the upper story. Analysis the station environment condition. Obtain the time for fire develop to start to endanger the safety of life. Using evacuation software to numerical calculate the time of evacuation when the platform on fire. Observe the process of evacuation. Found the floor effective width is critical to the evacuation. And puts forward the relevant safety evacuation strategy. To use the finite element to simulate the temperature and mechanical field of tunnel lining structure on different standard and real temperature curve. Analysis the fire resistance of lining structure. Finally by comparing the numerical simulation results with the norm design and theoreis calculation, conclude that the advantages of the performance-based fire safety design and will bring huge economic benefits.