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为了研究斜拉索风雨激振中拉索和水线上的气动力,制作了直径为350mm的拉索模型,采用强迫振动装置,对粘贴水线的二维拉索进行了5种工况下的测压风洞试验。系统研究了水线的存在、模型竖向和扭转振动对拉索和水线的平均风压系数、脉动风压系数、平均气动力系数、脉动升力系数功率谱等的影响,并对准定常理论在风雨激振理论分析中的适用性进行了验证。结果表明:准定常理论能反映拉索和水线气动力的主要特征;拉索竖向振动和水线周向摆动基本不影响拉索和水线的平均气动力系数,拉索平均升力系数在60°风攻角处发生突降;水线的周向摆动对脉动气动力的影响很大,远大于拉索竖向振动的影响;水线的存在不仅使水线附近的风压系数发生突变,而且还降低了旋涡脱落频率。
In order to study the aerodynamic forces on the cable and waterline during the wind-rain vibration of the stay cable, a cable model with a diameter of 350mm was manufactured. The forced vibration device was used to simulate the two-dimensional cable attached to the waterline under five conditions Wind Tunnel Test. The existence of waterline, the effect of vertical and torsional vibration of the model on the average wind pressure coefficient, fluctuating wind pressure coefficient, average aerodynamic coefficient and pulsating lift coefficient power spectrum of the cable and waterline are systematically studied. The quasi-stationary theory The applicability of the wind-rain excitation theory is verified. The results show that the quasi-stationary theory can reflect the main characteristics of the aerodynamic forces of the cable and the waterline. The vertical vibration of the cable and the circumferential waterline do not affect the average aerodynamic coefficient of the cable and the waterline. The average lift coefficient of the cable 60 ° wind attack angle at the sudden drop; circumferential waterline vibration on the pulsating aerodynamic impact is much larger than the vertical cable vibration effect; the existence of the waterline not only changes in the water pressure coefficient of the sudden change , But also reduces the vortex shedding frequency.