大尺度高低跨柱面屋盖的风压系数分区研究

A zoning method of wind pressure coefficients on a large-scale unequal-height cylindrical roof

针对大尺度高低跨柱面屋盖体系风压分布变化梯度较大、跨间相互干扰以及此类屋盖风压分区无相关规范可查阅等问题,在得到各种风向下最不利极值风压的基础上,采用K-means聚类的风压系数快速分区方法将高低跨柱面屋盖表面划分为多个区域,并计算了各区域的分区风压系数。同时,在高低跨柱面屋盖风压系数分区研究过程中,对K-means方法的k值取值范围和最佳k值确定方法进行针对性改进。结果表明,高低跨柱面屋盖的边缘属于风敏感部位,而中间部分风压变化较小,因而在进行大尺度平屋盖抗风设计时,采用聚类方法进行风压分区更为合理。

For large-scale unequal-height cylindrical roofs wind-resistant cladding design,the change gradient of wind pressure distribution is larger with cross boundary interference. Meanwhile there is no relevant code for wind pressure zoning of roof. The K-means clustering method is adopted to achieve optimal multiple partitions of this roof and the corresponding wind pressure coefficients are calculated according to the peak pressures in every wind incident flow direction. The K-means clustering method is a quick zoning method,which can accommodate the large gradients of wind pressure distribution,interference effects between the two unequal-height cylindrical roofs and lacking of pressure partitions basis. Initial k value ranges and optimal values are improved for the large-scale unequal-height cylindrical roofs. The results show that wind-sensitive areas are located around the edges of the roofs and the middle parts don’t have much changes of wind pressure. The K-means clustering method is more reasonable for wind pressure partitioning especially for large-scale unequal-height cylindrical roof design.