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在深水桥墩地震动水压力分析中一般假定水底为完全反射边界,而忽略水底柔性介质对动水压力波的吸收作用。该文考虑水底柔性反射边界,基于辐射波浪理论,建立了深水桥墩地震动水压力的计算公式,深入分析了水底柔性反射边界对动水压力的影响。研究表明:水底柔性反射边界会在特定的荷载激励频率范围内对深水桥墩动水压力产生影响,且动水压力随水底反射系数的减小而减小,深水桥墩地震动水压力分析可以忽略水底柔性边界的影响。从而为长大桥梁地震灾变过程精细化模拟提供了理论依据。
In the analysis of seismic water pressure of deepwater pier, it is generally assumed that the underwater bottom is the complete reflection boundary and the absorbing effect of underwater flexible medium on the hydrodynamic pressure wave is neglected. In this paper, the boundary of underwater flexible reflection is considered. Based on the radiation wave theory, the formula of the groundwater pressure of deepwater piers is established, and the influence of flexible reflection boundaries on hydrodynamic pressure is deeply analyzed. The results show that the boundary of flexible bottom reflection will affect the hydrodynamic pressure of deep-water pier within a certain range of load excitation frequency, and the hydrodynamic pressure will decrease with the decrease of bottom reflection coefficient. The analysis of groundwater pressure in deep-water pier can be ignored Effect of flexible boundaries. Which provides a theoretical basis for the elaborate simulation of the earthquake catastrophic process of the bridge.