桩基础承台水平附加质量分析

基于速度势理论 ,研究了水中桩基圆形承台作水平简谐运动时 ,承台侧面的动水压力 .提出了一个有效的计算承台侧面动水压力的半解析半数值方法 ,进而得到附加质量系数 .该方法不仅能考虑自由表面波对动水压力的影响 ,而且还适用于位于任意水深处的承台 .分析表明 ,水面附近的承台作低频简谐运动时 ,承台上的动水压力受表面波影响较大 ;而承台作高频简谐运动时 ,受表面波影响很小 .此外 ,采用修正Morison方程常规附加质量系数 ,会夸大水对承台的作用

Analysis of Horizontal Added Mass on Pile Cap

Basing on the potential theory,hydrodynamic pressure on the side of circular pile cap with harmonic horizontal movement was investigated.An efficient semi-analytical and semi-numerical approach for hydrodynamic pressure on the side of circular pile cap harmonic was developed,as well as coefficient of added mass.This method not only is able to consider gravity waves on the water surface,but also be applied to pile cap in the arbitrary depth of water.Results of analysis illustrated that for pile cap near the surface of water,surface wave would have significant effect on hydrodynamic pressure in the case of low frequency of movement,while there is little effect of surface wave induced by high frequency of movement.Besides,using coefficient of added mass in modified Morison equation would over-evaluate the hydrodynamic force on pile cap.