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中文摘要：
为研究三维（3D）柔性桥梁及其二维（2D）刚性节段模型的高阶涡振幅值换算系数,采用一3D多点弹性支撑气弹模型开展风洞试验实测高阶涡振响应,并基于该气弹模型的模态参数按照1：1的原则设计制作2D刚性节段模型开展对比风洞试验研究。气弹模型与节段模型之间的几何缩尺比为1,两者具有相同的截面尺寸、等效质量、固有频率以及阻尼比;风洞试验实测到了气弹模型和节段模型对应不同模态阶次的高阶涡振锁定现象。试验结果表明：对于同阶模态,气弹模型和节段模型的起振风速、振动卓越频率以及区间跨度吻合良好,在高阶涡振幅值换算关系上,气弹模型约为节段模型的1.3倍。
英文摘要：
In order to investigate the conversion factor of high-order vortex-induced vibration（ VIV） between 3D flexible bridges and 2D rigid sectional models,a set of wind tunnel tests based on a 3D multi-supported aeroelastic model was performed,and its high-order VIV responses were recorded; then after,comparative wind tunnel tests with the sectional models of the same geometric scale and configuration as the aeroelastic model were conducted. The geometrical scale factor between the aeroelastic model and sectional models was equal to 1,which means these models have the exactly same cross section dimensions,equivalent mass,natural frequencies and damping. The VIV lock-in phenomena of the aeroelastic and sectional models were observed in wind tunnel tests. The onset velocities,dominant vibration frequencies and lock-in range of these models are in good accordance with each other. The results from the comparative tests show that the maximum high-order VIV amplitudes of the flexible aeroelastic model are roughly 30% higher than those of the 1： 1 sectional model.
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