钝体分离式双箱梁涡振优化措施研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (7) : 116-122.

论文

钝体分离式双箱梁涡振优化措施研究

李永乐，陈科宇，汪斌，孙浩

作者信息 +

Optimal measures for vortex-induced vibration of a bluff body separated twin-box girder

LI Yong-le，CHEN Ke-yu，WANG Bin，SUN Hao

Author information +

文章历史 +

摘要

随着桥梁跨径不断增大，桥梁结构的抗风性能越来越关键。分体箱梁具有优越的颤振稳定性，故在桥梁建设中具有广阔的应用前景，但其涡振现象较为明显。目前针对分离式双箱梁断面的涡振优化研究较多，但都是以流线型较好或高宽比较小的箱梁为研究对象，对钝体断面的研究较少。本文以某钝体分离式双箱梁桥为研究对象，通过风洞试验研究了导流板、分流板、风嘴等不同气动优化措施对主梁断面涡振性能的影响，并确定出优化性能最佳的措施。研究结果表明：风嘴措施对钝体分离式双箱梁的竖向涡振以及扭转涡振均具有较好的抑制效果；且风嘴角度越小，抑振效果越好。

Abstract

With increase in span, wind-resistant performances of bridges are more and more critical. Due to its superior flutter stability, separated twin-box girder has a broad application prospect in bridge construction. But its vertex-induced vibration (VIV) phenomenon is obvious. Although there are a lot of VIV optimization studies for separated twin-box girders, most of them are focused on good streamline type of box girders. The optimization study on VIV of bluff body separated twin-box girders is very scarce. Here, a certain bluff body separated twin-box girder bridge was taken as a study object, wind tunnel tests were conducted to study influences of aerodynamic measures, such as, guide vane, splitter plate and wind fairing on the VIV performance of the main beam cross-section to determine the optimal measure. The results showed that wind fairing can effectively suppress vertical and torsional VIV of bluff body separated twin-box girders; the smaller the wind fairing angle, the better its vibration-suppressing effect.

导出引用

李永乐，陈科宇，汪斌，孙浩. 钝体分离式双箱梁涡振优化措施研究[J]. 振动与冲击, 2018, 37(7): 116-122

LI Yong-le，CHEN Ke-yu，WANG Bin，SUN Hao. Optimal measures for vortex-induced vibration of a bluff body separated twin-box girder[J]. Journal of Vibration and Shock, 2018, 37(7): 116-122

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