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以某大跨度屋盖结构火车站风洞实验研究为例,分析大跨度三跨双坡曲面屋盖的风荷载特性,并利用刚性模型风洞试验得到的脉动压力数据进行风致振动分析,试验结果表明:在屋面边缘及屋脊附近的上吸风荷载绝对值要比屋面内部区域值大,屋面波谷区域风荷载值在-0.5~-1.0 kN/m~2范围内,悬挑位置及屋脊上吸风荷载值最大可达-5.0 kN/m~2;脉动风压系数一般在迎风屋檐附近比较大,可达0.6。研究同时表明大跨屋盖的风荷载取值受建筑外形、周边干扰、结构特性、风向等因素影响明显,需要进行全面深入的分析研究。
Taking the wind tunnel experiment of a long-span roof structure train station as an example, the wind load characteristics of the long-span three-span and two-slope curved roof are analyzed and the wind-induced vibration is analyzed by using the fluctuating pressure data obtained from the wind tunnel test of the rigid model. The results show that the absolute value of the upper air suction load near the edge of the roof and the roof is larger than the internal value of the roof. The wind load of the trough area in the roof is within the range of -0.5 ~ -1.0 kN / m ~ 2. Wind load value up to -5.0 kN / m ~ 2; pulsating wind pressure coefficient is generally larger in the windward eave, up to 0.6. The research also shows that the value of wind load of long-span roof is significantly affected by factors such as building shape, surrounding disturbance, structural characteristics and wind direction, which require comprehensive and in-depth analysis.