流—固耦合效应对桩柱频率特性的影响分析

Influence on Pile Frequency Characteristic by Fluid-structure Interaction Effect

基于流—固耦合的桩柱横向振动理论,利用有限元软件分析水深与桩柱高度之比、桩柱综合折算弹性模量、空心桩柱壁厚与外径之比等因素对流—固耦合效应的影响,分析结果表明:流—固耦合效应会减小桩柱的自振频率,桩柱的综合折算弹性模量会影响桩柱高、低阶横向振动频率的衰减,空心桩柱壁厚与外径之比会影响其一阶横向振动频率的衰减幅度。

Based on pile＇s lateral vibration theory with considering fluid-structure interaction （FSI） effect, the finite element software is applied to analyze the influence on FSI effect by the ratio of water depth to pile height, the corrected elastic modulus of piles, and the ratio of wall thickness to external diameter of hollow piles etc. The results show that the FSI effect decreases natural vibration frequency of the piles, the corrected elastic modulus of the piles influences the attenuation of high/low order lateral vibration frequency; the ratio of wall thickness to external diameter of the hollow piles influences the attenuation amplitude of the first order lateral vibration frequency.