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摘要
In order to obtain the data of the stack pressure distributions of high-rise buildings in natural meteorological conditions, a three-year’s field measurement of the stack effect of totally 13 high-rise residential and super high-rise commercial buildings in winter, which are located in the Northeast, the East, and the South China respectively, has been performed in this study. It is found that the distribution of the pressure difference in the whole elevator shaft is approximately linear, and the maximum absolute values always occur at the bottom and top floors. For example, the maximum stack pressure under investigation reaches as high as 171.0 Pa among seven residential buildings, and 117.3 Pa among six commercial buildings respectively, which far exceeds the bearing thresholds of the elevator systems, and that is exactly the reason for the elevator failure. The concept of the stack pressure coefficient of elevator is firstly introduced, and then a new evaluation model for estimating the maximum stack effect pressure is proposed on the basis of the classical model. The values of the stack pressure coefficient of the buildings are then calculated according to the field measurement data, which are all greater than 0.5. Compared with other existing models, the model possesses the advantages of quantifying the total airtightness of the building by combining with the field measurement data, and can be used to calculate the possible maximum stack pressure that the building might experience. ? 2023 Science Press.
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