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通过对吉林火车站的刚性模型风洞试验研究,得到了在有无周边建筑群干扰下屋盖表面的风压系数等值线图、脉动风压系数与屋盖的升力系数随风向角的变化曲线,对其风压分布特性做了详细的对比分析研究。研究结果表明:大跨屋盖结构表面主要呈现负风压(风吸力),屋盖合力升力系数均为负值。主站楼在迎风区屋檐、悬挑区域及屋面凸起的天窗位置气流分离较大,风压变化明显,出现较大的负风压系数;由于站台雨篷四周开敞,气流流经站台雨篷时较为顺畅,气流分离较小,因而站台雨篷风压系数较小。
Through the wind tunnel test research on the rigid model of Jilin Railway Station, the contour map of air pressure coefficient on the surface of the roof under the disturbance of surrounding buildings is obtained. The coefficient of pulsating air pressure and the lift coefficient of the roof depend on the wind direction angle Curve, the wind pressure distribution characteristics of a detailed comparative analysis. The results show that the surface of the long-span roof mainly exhibits negative wind pressure (wind suction) and the resultant lift coefficient of the roof is negative. Main building in the windward area eaves, cantilevered area and roof raised skylight position airflow separation, wind pressure changes significantly, there is a larger negative pressure coefficient; as the platform awning open around the air flow through the platform rain The canopy is smoother and the airflow is less separated, so the wind pressure coefficient of the platform awning is smaller.