Chracteristics of Vibraition-induced Wind Forces on Large Span Roofs

大跨度屋盖风压特性研究。通过风洞试验获得了以下结果。1)风压脉动特性受屋面分离流再附着点的影响。2)平顶和下垂屋盖的脉动风压功率谱在特征频率处出现峰值，而高层屋面则没有明显的峰值，与来流的速度功率谱相似。3)再附着点背风处的颤振机翼压力是对流的，相关系数呈指数衰减。4)运动风压功率谱在运动频率处有先兆峰值，且峰值随运动频率接近脱涡频率而增大。

On chracteristics of wind preesure large span roofs. following resuits were obtained though wind tunnel tests. 1) Chracteristics of fluctuating wind pressures are effected by the re-attachment Point of separated flow over the roof. 2) Powerspctra of fluctuatinf g wind presures indicate peaks at the characteristic frequencys in cases of flat and sag roofs but for high rise roofs they have no predominant peak and are simlar to velocity powerspectra of oncoming flow. 3) Fuctuating wing pressures in the leeward of the the re-attachment point are convective with exponential decay of the corrlation. 4) Powerspectra of motion-induced wind pressures have predoinant peaks at the frequency of the motion and values of the peaks increase as the motion frequency close to the vortex shedding frequency.