Surveying the Pressure Variation in Emergency Staircase of High-righ Buidings in the Event of Fire

When fires happen in high-rise buildings, to prevent smoke and toxic gases into the emergency staircase, excess pressure must be created in the staircase by stair pressurization systems. Excess pressure in the staircase must be at permissible limits to stop the smoke, and cannot create a resistance force too big to open the exit door. Excess pressure in the staircase depends on many factors and complex changes in the emergency exit process. This paper presents simulation methods of pressure variation in the staircase in different situations. The simulation is performed using FDS software, a special software to simulate the dynamics of the fire. Thereby the paper proposes measures to improve operational efficiency of the stair pressurization systems