带高防抛网边主梁斜拉桥气动性能试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 238-244.

论文

带高防抛网边主梁斜拉桥气动性能试验研究

李前名1，李春光2，马行川1，龙俊贤1，陈银伟1

作者信息 +

Test study on aerodynamic performance of a side main beam cable-stayed bridge with high anti-throwing net

LI Qianming1, LI Chunguang2, MA Xingchuan1, LONG Junxian1, CHEN Yinwei1

Author information +

文章历史 +

摘要

为研究带高防抛网边主梁斜拉桥的气动稳定性能，以某跨铁路站场边主梁斜拉桥为工程背景，通过节段模型及气弹模型风洞试验综合研究了带高防抛网边主梁斜拉桥的气动稳定性能，并确定了其合理的气动优化措施。利用1:50比例节段模型风洞试验，测试了各个攻角下主梁的风振响应；在低紊流度流场条件下，通过改变防抛网透风率，对主梁的涡振性能进行优化。设计并制作1:100比例气弹模型，在不同地表风场类型中进行了风洞试验测试，研究了不同攻角及偏角下全桥气弹模型的涡振性能。风洞试验结果表明：均匀流场中，设置60%透风率的防抛网的节段模型与气弹模型，在最不利3°攻角下，仍发生超过规范限值的竖向涡振。节段模型试验中，在5%紊流风场条件下，主梁断面设置60%透风率的防抛网可以有效抑制涡振，且考虑三维效应的全桥气弹模型与节段模型试验结果相同，无涡振现象发生。

Abstract

In order to study the aerodynamic performance for a side beam cable-stayed bridge with high anti-throwing net, taking a cable-stayed bridge with high anti-throwing side girder as engineering background, the aerodynamic stability performance of cable-stayed bridge with high anti-throwing side girder is comprehensively studied through section model and aeroelastic model wind tunnel test, and reasonable aerodynamic optimization measures are determined. Wind-induced vibration responses of girders at different angles of attack are tested in a 1:50 scale sectional model wind tunnel test. Especially at the most unfavorable angle of attack, the eddy vibration performance was optimized by changing the ventilation rate of the shield and the turbulent intensity of the wind field. A 1:100 scale aeroelastic model was designed and fabricated. Wind tunnel tests were carried out in different surface wind field types. The eddy vibration characteristics of the full-bridge aeroelastic model at various angles of attack and deflection were studied and compared with the section. Wind tunnel test results show that the combination of anti-throw netting with 60% air permeability and 5% turbulence can effectively control the eddy vibration. The aeroelastic model considering three-dimensional effect conforms to the overall rule of the test results of the section model, but the eddy vibration response is lower than that of the slightly section model, at the same time, the wind speed range of the eddy vibration becomes narrower and shifts to the low wind speed range.

导出引用

李前名1，李春光2，马行川1，龙俊贤1，陈银伟1. 带高防抛网边主梁斜拉桥气动性能试验研究[J]. 振动与冲击, 2023, 42(17): 238-244

LI Qianming1, LI Chunguang2, MA Xingchuan1, LONG Junxian1, CHEN Yinwei1. Test study on aerodynamic performance of a side main beam cable-stayed bridge with high anti-throwing net[J]. Journal of Vibration and Shock, 2023, 42(17): 238-244

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