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基于势流体理论,针对一典型实体矩形截面桥墩,分析了不同水深时,动水对桥墩自振特性的影响.研究了不同水深和地震波类型等条件下,作用于桥墩上动水压力的分布规律及其合力作用点位置,并分析了动水对矩形截面桥墩在地震作用下动力响应的影响.结果表明,由于动水和结构相互作用的影响,矩形截面桥墩的自振周期、墩底弯矩及剪力的峰值会随着水深的增加而不断增大.动水使墩底弯矩和剪力分别最多增大了31%和50%,因此动水对桥墩动力反应的影响不可忽略.并且,不同类型地震波对作用于桥墩上的动水压力分布的影响也不相同.根据日本规范计算作用于矩形截面桥墩上的动水力的结果与本文的结果更为接近.
Based on the potential fluid theory, the influence of dynamic water on the natural vibration characteristics of bridge pier under different water depths is analyzed for a typical rectangular cross-section pier. The distribution of dynamic water pressure on bridge piers under different water depths and seismic wave types is studied The effect of hydrodynamic pressure on the dynamic response of the rectangular section pier under earthquake action is analyzed.The results show that due to the interaction of hydrodynamic and structural, the natural period of the bridge pier with rectangular section and the moment of the pier bottom And the peak value of shear force will increase with the increase of water depth.The hydrodynamic water increases the maximum moment and shear force of pier bottom respectively by 31% and 50%, so the influence of hydrodynamic water on the dynamic response of pier can not be neglected. , The influence of different types of seismic waves on the hydrodynamic pressure distribution acting on the piers is not the same.According to the Japanese code, the hydrodynamic effect on the rectangular piers is closer to the result of this paper.