斜拉桥斜拉索表面损伤状态下风致振动特性研究

刘庆宽1,2,孙一飞3,贾娅娅1,2,张磊杰3,马文勇1,2,刘小兵1,2

振动与冲击 ›› 2020, Vol. 39 ›› Issue (8) : 33-39.

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (8) : 33-39.
论文

斜拉桥斜拉索表面损伤状态下风致振动特性研究

  • 刘庆宽1,2,孙一飞3,贾娅娅1,2,张磊杰3,马文勇1,2,刘小兵1,2
作者信息 +

A study on wind-induced vibration characteristics of stay cables under surface-damaged state

  • LIU Qingkuan1,2,SUN Yifei3,JIA Yaya1,2,ZHANG Leijie3,MA Wenyong1,2,LIU Xiaobing1,2
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摘要

斜拉桥斜拉索在生产、运输、安装和运营过程中,可能产生划痕、裂缝等损伤,研究斜拉索在表面损伤状态下的风致振动特性,对于准确评估斜拉索在其服役期内的气动稳定性能具有重要意义。通过对光滑和表面存在凹痕的斜拉索模型进行风洞测振试验,分析了雷诺数、来流风向和凹痕尺寸等参数对斜拉索风致振动特性的影响规律,并对振动状态进行了初步判断。结果表明,表面存在凹痕的斜拉索模型的振动特征随雷诺数的整体变化趋势近似于光滑模型,但存在最不利风向,在此风向下,与光滑模型相比,表面存在凹痕的斜拉索模型的风致振动不仅在较低雷诺数发生,而且振幅较大,发生振动的雷诺数区间也较宽。此外,凹痕尺寸对斜拉索模型在试验雷诺数范围内风致振动特性的影响也非常显著,但并非简单的单调关系,而是与来流风向相关。根据模型风致振动频率与Den Hartog驰振准则,初步判断此风致振动不为涡激振动,而为驰振。

Abstract

During production, transportation, installation and operation, stay cables may surfer scratches and cracks.Studying wind-induced vibration characteristics of stay cables under surface damage is of great significance for accurately evaluating the aerodynamic stability of stay cables during their service life.Through wind tunnel tests of a smooth model and other models with 2 sizes of dent, the influences on wind-induced vibration characteristics of Reynolds number, wind direction and the size of dents were studied.And the vibration state was initially judged.Results show that the vibration characteristics with Reynolds number curve of the dent cable model is similar to that of the smooth model, but the maximum amplitudes of the dent cable model are larger than that of the smooth model in the worst wind directions.At the same wind direction, there are lower starting Reynolds number and wider Reynolds number interval of wind-induced vibration of dent models.Also, the size of dent influences wind-induced vibration characteristics prominently during test Reynolds number range, not a simple monotonous relation, but related to wind direction closely.This wind-induced vibration is initially judged to be galloping, not vortex-induced vibration, based on vibration frequency and Den Hartog criterion.

关键词

斜拉索 / 表面损伤 / 雷诺数 / 来流风向 / 风致振动

Key words

stay cables / surface-damaged / Reynolds number / wind direction / wind-induced vibration

引用本文

导出引用
刘庆宽1,2,孙一飞3,贾娅娅1,2,张磊杰3,马文勇1,2,刘小兵1,2. 斜拉桥斜拉索表面损伤状态下风致振动特性研究[J]. 振动与冲击, 2020, 39(8): 33-39
LIU Qingkuan1,2,SUN Yifei3,JIA Yaya1,2,ZHANG Leijie3,MA Wenyong1,2,LIU Xiaobing1,2. A study on wind-induced vibration characteristics of stay cables under surface-damaged state[J]. Journal of Vibration and Shock, 2020, 39(8): 33-39

参考文献

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