气动措施抑制桥梁涡振机理研究

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (1) : 73-76.

论文

气动措施抑制桥梁涡振机理研究

许福友1;林志兴3;李永宁3;楼文娟1

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RESEARCH ON VORTEX RESONANCE DEPRESSION MECHANISM OF BRIDGE DECK WITH AERODYNAMIC MEASURES

XU Fuyou1;LIN Zhixing3;LI Yongning3;LOU Wenjuan1

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摘要

通过表面测压方法研究了桥梁主梁基本断面、添加抑流板或导流板后断面的涡激共振特性；基于三种断面不同风速各测点压力时程，综合对比分析脉动压力系数均值、标准差、功率谱及局部与总体气动力相关性对涡振的影响，揭示了扭转涡振及气动措施抑振的机理。研究发现：扭转涡振的根本原因是上表面上游的分离使得中游和下游区域压力脉动非常强烈，各测点脉动压力具有相同卓越频率，且与总体气动力具有良好的相关性；本文抑流板改善了上表面流场分布，有效抑制了涡振；而导流板对上表面流场基本无影响，未能抑制涡振。

Abstract

The vortex vibration characteristics of one bridge deck with airflow-suppressing board, guide vane and without any aerodynamic measures are investigated by face pressure measuring method. Based on three sections pressure time histories at different wind velocities, the means, standard deviations, power spectra of fluctuated pressures, as well as the correlations between local and total aerodynamic forces are comprehensively analyzed, and the tosional vortex mechanism and aerodynamic measures suppressing mechanism are disclosed. It reveals that severe fluctuation of pressure at the middle and downstream regions at the upper face construct the fundamental momentum for vortex resonance, which are incurred by the flow separation at the front upper face. The fluctuated pressures keep the same dominant frequencies. And the local aerodynamic forces keep good correlations with the total ones. The flow distribution at the upper face is adjusted and improved by the airflow-suppressing board, and the vortex resonance is effectively suppressed. For the negligible influence on flow fields at upper face, the guide vane is ineffective.

导出引用

许福友;林志兴;李永宁;楼文娟. 气动措施抑制桥梁涡振机理研究[J]. 振动与冲击, 2010, 29(1): 73-76

XU Fuyou;LIN Zhixing;LI Yongning;LOU Wenjuan. RESEARCH ON VORTEX RESONANCE DEPRESSION MECHANISM OF BRIDGE DECK WITH AERODYNAMIC MEASURES[J]. Journal of Vibration and Shock, 2010, 29(1): 73-76

中图分类号： U448