Volume 18, No. 2, 2024
Received: 2023/09/23, Accepted: 2024/03/10
Authors:
DING Huiqi;
Abstract:
Based on the wind tunnel test data, the wind pressure characteristics of low-rise buildings with gable roofs are discussed and compared with the standard values under different roof slopes, eave heights, and terrains. In order to further analyze the variation mechanism, a numerical simulation investigation was carried out for some conditions. The results show that when the roof slope is less than 3:12, the negative value of the shape coefficient for the windward roof of the building can be up to -0.89, far exceeding the code value of -0.5. It is suggested that when the slope is not larger than 3:12, the shape coefficient of the windward roof should be -0.9, and the leeward roof should be determined by linear interpolation in the interval -0.4~-0.75 according to the slope size. With the increase of eaves height and the decrease of ground roughness, the vortex intensity of the roof and leeward surface increases, and the area proportion of high negative pressure area in the vortex influence range increases. Thus, the negative value of the shape coefficient for the roof and leeward surface becomes larger, which is in excess of the code value. It is suggested that the shape coefficient of the windward roof should be -0.95 under the eave height of 12 m. Meanwhile, those of the leeward roof, leeward surface, and side wall 2 should be -0.6 under open terrain.
Keywords:
low-rise buildings; wind tunnel test; wind load; shape coefficient; numerical simulation