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高层建筑外附雨篷的表面风压和气动力系数
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Surface Wind Pressure and Aerodynamic Coefficients of Canopy Affiliated to High-rise Buildings
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    采用风洞试验方法研究高层建筑外附雨篷的风压特征,分析风压系数、风压相关性、非高斯性和整体升力系数随风向角的变化,给出围护结构的设计风压,最后研究倾角和出挑长度对整体力系数的影响. 研究发现,高层建筑外附雨篷上表面风压系数在正迎风时最大值接近1.4,系气流受到后方高层建筑的阻挡下翻导致;上、下表面的最大整体压力系数出现正迎风情况,最大值分别为1.24和0.76;上、下表面的最大整体升力系数出现侧风面,最大值分别为1.13和1.01;上下叠加后测点风压的非高斯性比单表面增强;上表面和下表面的升力系数在0°~70°风向呈现高斯分布,在80°~180°风向呈现较强的非高斯分布;高层建筑外附雨篷上表面的极值正压大于下表面;雨篷整体升力系数按照倾角-10°、0°、10°依次递增.

    Abstract:

    The wind tunnel test method is employed to study the wind pressure characteristic of the canopy affiliated with high-rise buildings. The variation of wind pressure coefficient, wind pressure correlation, non-Gaussian, and overall lift coefficient with the wind direction angle is analyzed. The design wind loadings on the building envelope are also given. Finally, the influence of tilt angle and cantilevered length on the overall lift coefficient is investigated. Studies show that the maximum wind pressure coefficients of the upper surface of the canopy affiliated with the building reach almost 1.4 in the wind-facing direction, which can be attributed to the fact that the airflow is blocked by the high-rise building and then turned down on the canopy. The overall press coefficients of the upper and lower surface reach their maximum values in the wind-facing direction, and the coefficients are 1.24 and 0.76, respectively. The overall lift coefficients on the upper and lower surface reach their maximum values at the side direction, and their values are 1.13 and 1.01, respectively. After being superimposed on the upper and lower surface, the pressure presents a higher non-Gaussian distribution property than those on each surface. The lift coefficients of the upper and lower surfaces show a Gaussian distribution in the wind direction of 0°~70° and a non-Gaussian distribution in the wind direction of 80°~180°. The positive extreme wind pressure coefficient on the upper surface of the canopy affiliated with the building is higher than that on the lower surface. The overall lift coefficients of the canopy increase in sequence with the attack angle of -10°, 0°, and 10°.

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沈国辉 ?,李懿鹏 ,韩康辉 ,余杭聪 ,邵剑文 .高层建筑外附雨篷的表面风压和气动力系数[J].湖南大学学报:自然科学版,2023,(7):120~129

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  • 在线发布日期: 2023-07-31
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