摘要
为研究扇形高层建筑的风荷载特性及风压分布规律,基于雷诺平均方程对某高层扇形截面建筑进行了数值模拟。首先进行了网格选取和数值模拟准确性验证。然后采用剪切应力运输模式的k-ω湍流模型计算分析了扇形高层建筑在不同风向角下的气动特性和风压分布规律。最后讨论了不同矢弦比对扇形建筑的气动特性的影响,并将计算所得扇形截面建筑体型系数整理成表以供参考。研究表明:除短轴迎风工况外,其他风向角下扇形建筑整体顺风阻力效应大于横风效应。沿长轴向倾覆力矩对风向角变化最敏感,沿短轴方向倾覆力矩变化幅度较小,扭转效应不显著。不同风向角下,扇形建筑正负风压区均以竖向尖锐边缘为界限,存在明显的“边缘效应”。整体阻力、沿长轴倾覆力矩随扇形矢弦比增大而线性减小。
In order to study the wind load characteristics and wind pressure distribution of fan-shaped high-rise buildings, a high-rise building with fan section is numerically simulated based on Reynolds-averaged Navier-Stokes equations(RANS).Firstly, the grid selection and the accuracy of numerical simulation are verified.Then the k-ω turbulence model of Shear Stress Transport model is used to calculate and analyze the aerodynamic characteristics and wind pressure distribution of fan-shaped high-rise buildings under different wind angles.Finally, the influence of different rise chord ratio on the aerodynamic characteristics of fan-shaped buildings is discussed, and the calculated shape coefficients of fan-shaped buildings are compiled into a table for reference.The major results can be summarized as follows: In addition to the short axis windward working condition, the overall downwind effect of fan-shaped buildings is greater than the crosswind effect;the overturning moment along the long axis is most sensitive to the change of wind direction angle;the change of overturning moment in the direction of minor axis is small;the torsion effect is not significant. Under different wind direction angles, the positive and negative wind pressure areas of fan-shaped buildings are bounded by vertical sharp edges, and there is an obvious “edge effect”. The overall resistance and the long axis torque decrease linearly with the increase of the rise chord ratio of the sector.
作者
楚晨晖
陈少林
CHU Chenhui;CHEN Shaolin(Wuxi Research Center for Environmental Science and Engineer,Wuxi 214100;WuXi City College of Vocational Technology,Wuxi 214100;Department of Civil and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211100)
出处
《北京建筑大学学报》
2022年第6期77-87,共11页
Journal of Beijing University of Civil Engineering and Architecture
基金
国家自然科学基金项目(51978337)。
关键词
扇形建筑
风荷载
数值模拟
体型系数
fan-shaped building
wind load
numerical simulation
shape coefficient
