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边箱式π型断面涡振性能及导流板措施参数研究
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Study on Vortex-induced Vibration Performance of π-shaped Side-box Section and Measurement Parametric of Guide Vanes
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    摘要:

    π型断面因构造简单与受力性能好,被广泛应用于桥梁建设中,但其抗风性能差,易产生涡激振动问题.本文以边箱式π型断面桥梁为研究对象,采用宽高比10∶1的π型断面刚体节段模型进行同步测振测压试验,并且通过计算流体力学方法加以对比验证,研究π型断面涡振性能与导流板抑振机理.试验结果表明:边箱式π型断面在0°、±3°风攻角下发生显著涡激振动,通过在断面两侧加设特定形式及尺寸参数的导流板措施可抑制断面竖弯及扭转涡振.其中,倒L型导流板措施气动优化效果显著,可有效消除涡振振幅,而水平导流板措施的抑振效果有限,相较于竖弯涡振,扭转涡振对于水平导流板尺寸参数更为敏感.通过对比数值模拟结果与表面气动压力分布,表明倒L型导流板措施能够优化断面气动外形,削弱断面上下表面旋涡脱落尺度和能量,同时降低断面所受的周期性气动力,从而有效抑制断面涡振.

    Abstract:

    The π-shaped section is widely used in bridge construction because of its simple structure and good mechanical performance, but it is easy to generate vortex-induced vibration(VIV) because of its poor wind resistance. Therefore, in this paper, a bridge with π-shaped section with a side box type is taken as the research object, and the same step vibration and pressure measurement test is carried out by using a π-shaped section rigid section model with an aspect ratio of 10∶1. Moreover, the vorticity vibration performance of π-shaped section and the vibration suppression mechanism of the deflator are studied by comparing and verifying the method of computational fluid dynamics. The experimental results show that significant VIV occurs at wind attack angles of 0° and ±3°. The vertical bending and torsional VIV can be suppressed by adding a guide plate with specific form and size parameters on both sides of the section. Among them, the inverted L-shaped baffle has a significant aerodynamic optimization effect, which can effectively eliminate the VIV amplitude, while the horizontal baffle has a limited vibration suppression effect. Compared with the vertical curved VIV, the torsional VIV is more sensitive to the size of the horizontal baffle. By comparing the numerical simulation results with the surface aerodynamic pressure distribution, the inverted L-shaped baffle can optimize the aerodynamic profile of the section, weaken the scale and energy of vortex loss on the upper and lower surfaces of the section, and reduce the periodic aerodynamic force on the section, thus effectively suppressing the VIV of the section.

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WANG Feng, XING Feng, XIONG Chuan, WANG Jiaying?,ZHENG Xiaodong, ZHANG Jiupeng, HUANG Xiaoming.边箱式π型断面涡振性能及导流板措施参数研究[J].湖南大学学报:自然科学版,2024,(5):114~122

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  • 在线发布日期: 2024-05-30
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