双曲抛物面鞍形屋面风压分布的实验研究

Wind Pressure Distrbution on Hyperbolic Paraboloid Shell Roofs

本文根据双曲抛物面鞍形屋面模型的风洞实验,得到了风压分布系数的初步结果.实验是分别在模拟的大气边界层和均匀流两种流场中进行的.我们根据不同风向作用下屋面风压的实测分布规律,给出了最大风压系数和整个屋面的平均风压系数.另外还就不同矢跨比(F/L=1/10～1/20)的模型进行了实验.由这些实验结果表明,风向对屋面风压分布起着最为重要的作用.在所研究的矢跨比范围内,最大风压系数C_P=-4.6q,最大平均风压系数(绝对值)(?)_p=-0.75q(q 为速压).

Wind pressure distribution was investigated on the hyperbolic paraboloid(H.P.)shaped shell roofs by model test in the wind tunnel with smooth flow and tur-bulent flow.Wind pressure distribution and the contours of wind pressure on shellroofs were determined for various wind directions.The average suctions of the roofswere computed.The effects of the rate of sag and span on the pressure distributionwere studied by a series of models.It was concluded that the wind direction wasthe most important factor that affects the wind pressure distribution on H.P.-shaped shell roofs.The highest point suction encountered was -4.6q while themaximum average suction on the roof was -0.75q.