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通过风洞试验研究了武汉火车站屋盖和雨棚的表面风荷载分布特征,着重分析了大型悬挑和镂空吊顶对风压分布的影响。屋盖的大型悬挑对局部风压影响很大,当来流斜吹时,悬挑局部区域的体型系数可达-2.2,而由于玻璃幕墙的阻挡作用,悬挑下方在某些风向会产生0.6的正压体型系数。下表面镂空时的上表面内侧风压和密闭时的下表面风压基本一致。在整体设计时,可按封闭模型的试验结果进行取值。通过对总受力和压力方差的统计分析,获得了不同风向下结构受风力作用的大小和离散程度,可为评估不利风向角提供重要参考依据。
Through the wind tunnel test, the surface wind load distribution characteristics of roof and canopy of Wuhan Railway Station are studied. The influence of large cantilevered and suspended ceiling on wind pressure distribution is emphatically analyzed. The large cantilever roof has a great influence on the local wind pressure. When the flow is obliquely blown, the body factor in the cantilevered local area can reach -2.2. Due to the blocking effect of the glass curtain wall, the under cantilever will generate in some wind directions 0.6 positive pressure type coefficient. The inner surface of the upper surface of the hollow when the lower surface of the air pressure and the lower surface of the air pressure is basically the same seal. In the overall design, according to the closed model test results for value. Through the statistical analysis of the variance of total force and pressure, the size and discrepancy of the wind force under different wind directions can be obtained, which can provide an important reference for evaluating the adverse wind direction angle.