地震动水荷载对深水高桩承台结构非线性动力响应的影响研究

Research on the Influence of Ground Water Load on the Nonlinear Dynamic Response of Deep Water High Pile-Bearing Structure

针对桥梁结构服役期间存在累积损伤问题,采用ABAQUS软件的隐式动力学模块对深水高桩承台结构非线性地震动响应进行研究,分析了线性和非线性两种状态下的结构动力响应差异以及地震动水力对其动态性能的影响。结果表明,承台—群桩连接部位的损伤主要受剪力控制,桩身埋入土体部分的损伤受弯矩和剪力共同控制;相比于线性状态,结构处于非线性状态时振动周期长,振幅衰减慢,结构变形大,结构动力响应最大增幅可达108%;尽管仅靠动水荷载作用并不足以使群桩淹没区产生破坏,但动水荷载对对结构非线性状态下的动力响应有一定放大作用,最大幅度达到32.49%。

In regard with the problem of cumulative damage during the service of bridge structures,the ABAQUS implicit dynamics module is used to study the nonlinear ground motion response of deep water high pile bearing structures,and the difference of structural dynamic response in linear and nonlinear states and the influence of ground hydraulics on their dynamic performance are analyzed.The results show that the damage of the connection between the pile and the pile is mainly controlled by the shear force,and the damage of the part of the pile buried in the soil is controlled by the bending moment and shear force.Compared with the linear state,when the structure is in a nonlinear state,the vibration period is long,the amplitude attenuation is slow,the structural deformation is large,and the maximum increase in the dynamic response of the structure can reach 108%.Although the hydrodynamic load alone is not enough to cause damage to the inundation area of the piles,the hydrodynamic load has a certain amplifying effect on the dynamic response of the structure in the nonlinear state,and the maximum magnitude is 32.49%.