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基于强迫振动装置的拉索和水线气动力试验

, PP. 85-93

Keywords: 桥梁工程,斜拉索,风洞试验,风雨激振,强迫振动装置,气动力,准定常理论

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Abstract:

?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。

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