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文章介绍了西江特大桥平台钢管桩涡激振动的产生机理及解决对策。西江为季节性河流,汛期来临时湍急的洪水使平台钢管桩处于持续不断的流动及尾涡作用之下,当钢管桩后漩涡脱落的频率和钢管桩的固有频率接近时,将引起钢管桩的涡激共振,当此共振与结构发生“锁频”时就会造成结构破坏。在理论上简单介绍了涡激响应的数学模型。针对西江特大桥平台钢管桩实际发生的涡激振动现象,提出了合理的解决措施并应用于实际,经检验达到了消除共振的效果;并对来年洪水冲击可能产生的涡激振动提出了几点预防措施。
This paper introduces the generation mechanism and countermeasures of vortex-induced vibration of the steel pipe pile on the platform of Xijiang Bridge. The Xijiang River is a seasonal river. Floods during the flood season bring the platform steel pipe piles under continuous flow and wake vortex. When the vortex shedding frequency is close to the natural frequency of the steel pipe piles, it will cause Vortex tube pile vibration resonance, when the resonance and the structure of the “lock frequency” will result in structural damage. In theory, the mathematical model of vortex-induced response is briefly introduced. In view of the actual vortex-induced vibration phenomenon of the steel pipe pile of the platform of Xijiang Bridge, a reasonable solution is proposed and applied to the actual situation. After the test, the effect of eliminating resonance is achieved. And the possible vortex-induced vibration caused by flood in the coming year Preventive measures.