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中文摘要：
为了深入研究大长细比矩形截面杆件的风致振动机理,首先对一个典型宽高比的矩形断面开展节段模型风洞试验,识别截面的主要气动参数,实测涡振与驰振耦合状态下的＂软驰振＂响应;然后基于试验模型的结构动力参数采用Tamura数学模型进行相关的数值模拟,并与试验结果对比,研究流体参数以及结构参数对结构响应幅值的影响。通过对比研究确定影响＂软驰振＂幅值响应的主要参数,并基于广泛收集的实测数据开展回归分析,建立用于估算矩形截面构件＂软驰振＂幅值响应的经验公式。研究结果表明：矩形截面宽高比是幅值响应的关键影响参数,回归分析中多项式拟合曲线误差较小,建立的幅值估算经验公式合理可靠。
英文摘要：
In order to investigate the wind induced vibration mechanism of large slenderness ratio rectangular cylinders, rectangular sections with a certain aspect ratio were used for segment model wind tunnel tests. Aerodynamic parameters of the sections were identified and VIV and galloping coupled ＂ soft galloping＂ responses were measured. Numerical simulations were performed based on the structure dynamic parameters of the experimental model using Tamura mathematical model. The experimental and simulation results were compared. The effects of fluid and structure parameters on amplitude responses were investigated separately. The main parameters of amplitude response of ＂soft galloping＂ were determined. An empirical formula for predicting amplitude responses of rectangular cylinders was established by regression analysis of comprehensively collected experimental data. The results show that the aspect ratio of rectangular cylinder is the key parameter for affecting amplitude response, the error of fitting processes of regression analysis is small, and the proposed empirical amplitude estimation formula is reasonable and reliable.
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