Abstract: FDS fire numerical simulation method was used to analyze the influence of different width and depth of the patio on the pressure difference between the bottom and top of the patio, the temperature inside the patio and CO concentration in the corridor, to study the influence of the width and depth of the patio on the stack effect in high-rise residential buildings. Considering 3 kinds of fire source power, 4 kinds of open patio width and 4 kinds of open patio depth, 48 working conditions were set to carry out the analysis. It was found that the stack effect is weak due to the side connectivity in the open patio, and the width and depth of the patio have no obvious effect on the stack effect. The greater the width of the patio and the deeper the patio, the lower the temperature inside the patio and the CO concentration in the corridor.

Key words: open patio, outer corridor, fire smoke, stack effect, FDS