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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。
In order to further study the wind-induced vibration mechanism of large slenderness rectangular cross-section members, a segment wind tunnel test is firstly conducted on a rectangular section with typical aspect ratio to identify the main aerodynamic parameters of the cross-section. Then, based on the structural dynamic parameters of the test model, the relevant numerical simulation is carried out by using the Tamura mathematical model. Compared with the experimental results, the influence of fluid parameters and structural parameters on the structural response amplitude is studied. The main parameters influencing the amplitude response of the “soft Chi vibration” are determined through comparative study. The regression analysis based on the widely collected measured data is used to establish the empirical formula for estimating the amplitude response of the rectangular section member . The results show that the aspect ratio of rectangle section is the key influence parameter of amplitude response, the polynomial fitting curve error is small in regression analysis, and the established empirical formula of amplitude estimation is reasonable and reliable.