基于能量方法的塔周长吊索尾流驰振性能研究

Research on Wake Galloping of Long Suspenders near Bridge Tower Based on Energy Method

为了研究塔周长吊索尾流驰振的性能,发展了尾流驰振的能量分析方法。针对典型的双圆柱索尾流驰振,采用能量分析方法计算了下游索的驰振不稳定区域,从气动力做功的角度分析了尾流驰振的机理,并讨论了圆周运动半径、频率及来流风速对尾流驰振的影响。在验证分析方法可靠性的基础上,进一步分析了桥塔尾流致塔周长吊索尾流驰振的可能性。研究结果表明:能量分析方法所得结果与经典研究较为吻合,可用于判断实际结构发生尾流驰振的可能性;塔周长吊索的自振频率较低时存在发生尾流驰振的可能性。

In order to study the wake galloping characteristics of long suspenders near bridge tower, an energy method for wake galloping analysis was developed. The typical wake galloping of two circular cylinders was firstly analyzed to explore the unstable region of downstream suspender and the mechanism of wake galloping was analyzed from the work done by aerodynamic forces. The effects of various radii of circling motion, vibration frequencies and velocities of wind flow on wake galloping were further discussed. The occurrence possibility of wake galloping of long suspenders near bridge tower was analyzed after checking the reliability of the analysis method. The results show that the results with the energy method agree well with classical research results and the energy method can be used to estimate the occurrence possibility of wake galloping in practical structure. Long suspenders with low natural frequencies near bridge tower are prone to wake galloping.