刘庆宽, 郑云飞, 马文勇, 刘小兵. 雷诺数效应对斜拉索气动特性的影响[J]. 工程力学, 2013, 30(增刊): 284-289. DOI: 10.6052/j.issn.1000-4750.2012.05.S016
引用本文: 刘庆宽, 郑云飞, 马文勇, 刘小兵. 雷诺数效应对斜拉索气动特性的影响[J]. 工程力学, 2013, 30(增刊): 284-289. DOI: 10.6052/j.issn.1000-4750.2012.05.S016
LIU Qing-kuan, ZHENG Yun-fei, MA Wen-yong, LIU Xiao-bing. REYNOLDS NUMBER EFFECT ON AERODYNAMIC CHARACTERISTICS OF STAY-CABLES[J]. Engineering Mechanics, 2013, 30(增刊): 284-289. DOI: 10.6052/j.issn.1000-4750.2012.05.S016
Citation: LIU Qing-kuan, ZHENG Yun-fei, MA Wen-yong, LIU Xiao-bing. REYNOLDS NUMBER EFFECT ON AERODYNAMIC CHARACTERISTICS OF STAY-CABLES[J]. Engineering Mechanics, 2013, 30(增刊): 284-289. DOI: 10.6052/j.issn.1000-4750.2012.05.S016

雷诺数效应对斜拉索气动特性的影响

REYNOLDS NUMBER EFFECT ON AERODYNAMIC CHARACTERISTICS OF STAY-CABLES

  • 摘要: 斜拉索是斜拉桥的基本受力构件之一,其承受的风荷载占大桥总体风荷载的很大比例,且其风振问题是设计中需要重点考虑的问题。以风洞试验为研究手段,通过测力、测振和表面测压试验,研究了斜拉索在临界雷诺数范围内的气动力、振动特性、表面压力分布等问题,发现在临界雷诺数范围内,斜拉索上出现不可忽视的升力,最大升力系数会大于同样雷诺数时的阻力系数;升力的出现和不稳定的流场可能导致斜拉索发生大幅振动;从亚临界到临界雷诺数,斜拉索周围的流场从时间平均上的对称结构变为不对称结构,不对称的流场是产生升力的原因。

     

    Abstract: Cable is one of the basic construction members of a cable-stayed bridge. The wind loads on cables constitute a high proportion of total wind loads on bridge, and wind-induced vibration is an important problem of great concern in bridge design. By wind tunnel tests, force/vibration/surface pressure measurement tests were carried out, and aerodynamic forces, vibration characteristics and surface pressure distribution were studied. Results show that in a critical Reynolds number range, an un-negligible lift force appears, and the maximum of lift force coefficient is larger than the drag force coefficient in an identical Reynolds number value; that the appearance of a lift force and an unstable flow field can induce a large amplitude vibration; that from a sub-critical range to a critical range, the flow field around the cable changes to an asymmetric structure from a symmetric structure, the asymmetric flow field is the possible mechanism causing the lift force.

     

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