表面带凸起的圆柱形建筑风荷载数值模拟研究

Numerical simulation of wind load on cylindrical buildings with convex surfaces

黄骅港VTS雷达塔属于钢筋混凝土高耸结构,外部18根框架柱呈辐射状布置。以VTS雷达塔为背景,运用计算流体力学(CFD)方法对雷达塔结构及几个圆柱形结构的风荷载进行模拟,得到了结构表面不同凸起情况下的风场和风压分布规律。研究发现结构表面凸起的出现会直接影响风压系数分布曲线的平台区及结构尾流,负风压最大值会因为建筑物表面的凸起而大幅减小;风压系数分布曲线的平台区的宽度、正风压最大值与结构背风面尾流的状态、表面凸起高度等因素之间无明显关联。

The VTS radar tower in Huanghua Port is a reinforced concrete high-rise structure.The 18 frame columns were arranged radially.The computational fluid dynamics(CFD)method was used to simulate the wind load on cylindrical buildings with ridges,and the distribution of wind field was obtained based on the VTS radar tower.Results show that the appearance of convex surfaces impacts the platform area of wind pressure coefficient curves and leeward wakes of wind field directly.The maximum negative pressure is greatly reduced because of the convex surfaces of the building.The platform area width of pressure distribution curves and the maximum positive pressure are not obviously associated with state of the leeward wake of the structure and the height of convex surfaces.