门式钢桥塔涡激振动特性及机理研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (10) : 1-8.

论文

门式钢桥塔涡激振动特性及机理研究

雷伟1,2，王骑1,2，廖海黎1,2，李志国1,2

作者信息 +

Vortex-induced vibration characteristics and mechanisms of portal steel bridge tower

LEI Wei1,2，WANG Qi1,2，LIAO Haili1,2，LI Zhiguo1,2

Author information +

文章历史 +

摘要

钢桥塔是一种高耸细柔结构，对风荷载十分敏感，易发生涡激振动（vortex-induced vibrations, VIVs）。为研究某高度为217 m钢桥塔的涡激振动性能，开展了1:100缩尺比下的自立状态气弹模型风洞试验。试验结果表明，0°-30°风向角下，在低风速区间发生了两塔柱同相涡振，在高风速区间发生了反相涡振。其中，同相和反相涡振的最不利风向角分别为0°和10°，塔柱同相顺风向位移和反相扭转角分别为609.5 mm和4.3°。进一步地，通过计算流体力学（computational fluid dynamics, CFD）方法研究了两类涡振的发生机理。数值模拟结果表明，两塔柱附近旋涡交替脱落的频率与桥塔的基阶自振频率接近，由此在塔柱两侧产生的周期性压力差使得桥塔发生同相和反相涡振。本文的研究结果和结论可为同类型钢桥塔的抗风设计提供一定参考。

Abstract

The steel bridge tower is one kind of tall and slender structure which is highly sensitive to wind loads and prone to vortex-induced vibrations (VIVs). To investigate the VIV characteristics of a 217-meter-high steel bridge tower, 1:100 scale free-standing aeroelastic model wind tunnel tests were conducted. The experimental results show that in-phase VIVs occur in the low wind speed ranges, and out-of-phase VIVs occur in the high wind speed ranges at the wind directions range of 0° - 30°. The most unfavorable wind directions of in-phase and out-of-phase VIVs are 0° and 10°, respectively. In-phase along-wind displacement and out-of-phase torsion angle are 609.5 mm and 4.3°, respectively. Furthermore, the VIV triggering mechanisms were studied by computational fluid dynamics (CFD). The numerical simulation results show that the frequency of alternating vortex shedding near the two tower columns is close to the fundamental natural frequency, and the periodic pressure difference generated by this phenomenon leads to in-phase and out-of-phase VIVs. The findings and conclusions of this study provide some reference for the wind-resistant design of similar steel bridge towers.

导出引用

雷伟1,2，王骑1,2，廖海黎1,2，李志国1,2. 门式钢桥塔涡激振动特性及机理研究[J]. 振动与冲击, 2024, 43(10): 1-8

LEI Wei1,2，WANG Qi1,2，LIAO Haili1,2，LI Zhiguo1,2. Vortex-induced vibration characteristics and mechanisms of portal steel bridge tower[J]. Journal of Vibration and Shock, 2024, 43(10): 1-8

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