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本文着重研究高桩码头或海上桩基平台中所用的桩的动力特性及其在波浪作用下的动力响应问题。假定桩埋入土中足够深,以至可按无限长桩来考虑,桩露出土面的部分也有足够的长度,从而用动力嵌固深度的概念使桩下部复杂的受力情况得以简化。文中用有限元法对单机在波浪作用下的动力响应问题作了计算和分析。对于顶端嵌固于平台的桩,选用了一个实际平台的钢管桩群,用逆解法求得桩头约束刚度,对桩顶自由和桩顶有约束这两种情况分析了桩在外力作用下的变位和内力。
This paper focuses on the dynamic characteristics of piles used in high-piled wharfs or offshore pile foundation platforms and their dynamic response under wave action. Assuming that the pile is buried deep enough in the soil, it can be considered as an infinitely long pile, and the part of the pile exposed to the soil surface is also of sufficient length, so that the concept of dynamic embedment depth simplifies the complex force conditions at the lower part of the pile. In this paper, the finite element method is used to calculate and analyze the dynamic response of a single machine under wave action. For the piles with the top end embedded in the platform, a steel pipe pile group with an actual platform was selected. The constraint stiffness of the pile head was obtained by the inverse solution method, and the pile was subjected to external force under the conditions of the free top of the pile and the top of the pile. The displacement and internal forces.