Dynamic Response of Cross-Sea Bridge Pile Foundation Under the Coaction of Wave and Current

Bridges under the circumstances of marine environments are subject to extremely complicated loads. The precise calculation and estimation of two most important loads in deep sea, ocean waves and currents, is of essential influence to the construction of cross-sea bridges. On the basis of analyzing the effect of currents on the motion of waves and considering fluid-solid coupling effect, the paper derives the structural dynamics equation under the combined influence of waves and currents. Then, the finite element model for columns under the coaction of wave and current is constructed, and the corresponding computation program is compiled with MATLAB. The model can simultaneously estimate the drag force of current on the structure and the effect of structural deformation on the inertial force applied on it. Through model experiment, and comparing the varying effect of waves and currents on pile foundation with the changes of velocity, pile diameter and incident angle, the paper analyses the interactive effects between waves and currents, and the basic rules by which waves and current forces change with parameters.