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以青岛海湾大桥大沽河航道桥中央开槽主梁断面为研究对象,采用大尺度节段模型风洞试验方法,研究了不同阻尼比下两种导流板设置方案的涡振控制效果,分析了不同导流板特征尺寸和位置对随风速变化的涡振振幅的影响.试验结果表明:中央开槽断面的涡振性能较差,对导流板设置的变化比较敏感,涡振控制效果除了与原断面气动外形和槽宽有关之外,还与导流板本身的高度、长度和倾角密切相关,建议导流板高度设置需不受桥梁断面底部附属设施的阻碍,长度应适宜,倾角135°.
Taking the section of central slotted main girder of the Dagu River Channel Bridge of Qingdao Bay Bridge as the research object, the vortex-induced vibration control effects of two kinds of baffle schemes with different damping ratios are studied by the large-scale wind tunnel model. The influence of different size and position of the spoiler on the amplitude of vortex vibration with the variation of wind speed is analyzed.The experimental results show that the vortex vibration performance of the central slotted section is poor and sensitive to the change of the baffle setting, Besides the aerodynamic shape and groove width of the original section, it is also closely related to the height, length and inclination of the deflector itself. It is suggested that the height of the deflector be set free from the ancillary facilities at the bottom of the bridge section, the length should be suitable, and the inclination 135 °.