Abstract:

The paper used the method of field measurement and numerical simulation to study the effect of stack effect on the pressure difference distribution in the stairwell of aultra- highrise building. By choosing typical ultra-high-rise building to carry out the measurement research, obtaining the pressure distribution between the stairwell and atria, the paper has quantitatively analyzed the influence of the stack effect. It is pointed out that due to the separation effect of the refuge floor on the stairwell, the pressure difference in different zones shows a distribution law of dislocation growth. Combined with the results of numerical simulation, the original theoretical calculation formula of "stack effect" was revised, and a calculation formula of pressure difference suitable for super high-rise buildings was proposed.

Key words: ultra-high-rise building, smoke-proof stairwell, stack effect, pressure distribution