单个建筑物对平屋面风荷载的干扰效应试验研究

提出采用整体平均风压系数、第1阶振型广义力和屋面各区域最不利极值风压系数的干扰因子分别综合反映干扰效应对平屋面平均风荷载、脉动风荷载和极值风压的影响，采用刚性模型测压风洞试验，对被单个相同形体建筑所干扰的平屋面表面风压进行测量，研究改变建筑物之间的相对位置和风向角，平屋面整体平均风压系数和屋面第1阶振型广义力和最不利极值风压系数干扰因子的变化规律。研究结果表明：屋面整体平均风压系数干扰因子与第1阶振型广义力干扰因子分布规律相似；施扰物在受扰物的迎风上游，遮挡效应引起的缩小效应显著；沿与风向垂直方向，施扰物与受扰物并列布置时，放大干扰效应显著；斜风向条件下的干扰效应比0#x000b0;风向的影响范围大；干扰效应对屋面角部最不利极值风压影响显著，但对屋面中心区域的影响较小。

WIND INTERFERENCE EFFECTS OF ONE SIMILAR BUILDING ON FLAT ROOFS WITH EXPERIMENTS

Interference factors for the mean pressure coefficient of a whole roof, the 1st modal generalized force and the unfavorable peak pressure coefficient are proposed to respectively evaluate the interference effects on the mean wind loads, fluctuating wind loads of a whole roof and local peak pressure coefficients. Pressure measurements of a flat roof surrounded by a similar building in a wind tunnel are conducted to examine the effects of the arrangement and the wind direction on interference factors for the mean pressure coefficient, the 1st modal generalized force and the unfavorable peak pressure coefficient. The results show that: the distribution of interference factors for the mean pressure coefficient of a whole roof is similar to that for the 1st modal generalized force; the shielding induces reduction interference effects when the interfering building is in front of the interfered building; amplification interference effects are significant when the interfering building is parallel to the interfered building perpendicular to the wind direction; the interference scope at oblique wind directions is bigger than that at the wind direction of 0#x000b0;; the interference effect is significant on the unfavorable peak pressure coefficient in the roof corner, but it is very small in the center zone of the roof.