Experimental study on the interference intensity produced by the presence of neighboring buildings in the wind action in a tall building

Abstract The average strain on a building due to the action of the wind, can be significantly altered when considering the presence of one or more neighboring buildings. Such changes can be considered through the use of coefficients that take into account the distance that the neighboring building is from the building being studied. The present work was developed in order to verify the values currently adopted by the Brazilian standard that regulates the wind action in buildings. With the use of a wind tunnel, several tests were carried out in a standardized building considering the presence of other buildings with similar dimensions close to it. The distances between the buildings, the quantity and the layout of the neighboring buildings were taken into consideration. It was possible to conclude that, in general, the presence of the neighboring buildings produced an increase on the strain. Interference, in many situations, increased strain above the rates suggested by the current Brazilian wind action standard.

摘要 当存在一栋或多栋相邻建筑时，建筑所承受的风致平均应变会发生显著变化。此类变化可通过引入干扰系数进行量化考量，该系数需结合相邻建筑与研究对象建筑之间的间距确定。本研究旨在验证现行巴西建筑风荷载规范所采用的相关取值。研究借助风洞开展试验，以一座标准尺寸的模型建筑为研究对象，同时模拟周边存在尺寸相近建筑的工况，试验变量涵盖了建筑间距、相邻建筑的数量及布局形式。研究结果表明，总体而言相邻建筑的存在会使目标建筑的风致应变升高；在多数工况下，风致干扰效应使得应变值超出了现行巴西建筑风荷载规范所建议的限值。