中文摘要：

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。

英文摘要：

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 carded 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.