Cao Wenlong, Wang Xueyan, Liu Yubo, Yin Yujie, Yang Jian, An Jianhui
Department of Road and Bridge Engineering, Hebei Jiaotong Vocational and Technical College, Shijiazhuang, 050091, China.
School of Economics and Management, Shijiazhuang University, Shijiazhuang, 050091, China.
Sci Rep. 2023 Oct 16;13(1):17532. doi: 10.1038/s41598-023-44711-5.
Chamfered corners in buildings are the main means to reduce the control effect of wind load on the structure, and the interference effect of chamfered buildings cannot be ignored. At present, only the mutual interference coefficients of square and rectangular section buildings are given in the Chinese code, without the interference effect of chamfered buildings being specified. Therefore, in this paper, aerodynamic force and wind pressure coefficients of chamfered square cylinders of different spacing are obtained by the large eddy simulation method. Wind load characteristics, non-Gaussian characteristics and interference effects of chamfered square cylinders with different arrangements are studied based on aerodynamic coefficients, wind pressure coefficients and interference coefficients. The results show that when the wall y plus value is 1, the large eddy simulation is the most accurate to simulate the wind load and wind field parameters. Besides, the aerodynamic effects, non-Gaussian characteristics and interference effects between the chamfered square cylinders are mainly controlled by the cross-wind interval and the spacing (4.0, 4.0) is the characteristic coordinate. That means, when the spacing is smaller than this coordinate, the interference effect of the square cylinder is more obvious. When the spacing coordinate is greater than (4.0, 4.0), the aerodynamic coefficients and non-Gaussian regional distributions of the principal square cylinder and the isolated cylinder are the same, and the interference factor approaches 1.
建筑物的倒角是降低风荷载对结构控制作用的主要手段，倒角建筑的干扰效应不容忽视。目前，中国规范仅给出了方形和矩形截面建筑的相互干扰系数，未提及倒角建筑的干扰效应。因此，本文采用大涡模拟方法得到了不同间距倒角方柱体的气动力和风压系数。基于气动力系数、风压系数和干扰系数，研究了不同布置的倒角方柱体的风荷载特性、非高斯特性和干扰效应。结果表明，当壁面y+值为1时，大涡模拟对风荷载和风场参数的模拟最为准确。此外，倒角方柱体之间的气动效应、非高斯特性和干扰效应主要受横向风间距控制，间距(4.0, 4.0)为特征坐标。也就是说，当间距小于该坐标时，方柱体的干扰效应更明显。当间距坐标大于(4.0, 4.0)时，主方柱体和孤立柱体的气动力系数和非高斯区域分布相同，干扰系数接近1。
