Dynamic analysis of floating piers for curved bridge under wave load and effect of submerged annular rippled breakwater

Abstract

A theoretical model of a curved floating bridge with multiple floating piers and submerged annular rippled breakwaters built around the floating piers to reduce their dynamic responses is established. The wave excitation force and hydrodynamic coefficients of the floating piers of the curved bridge are obtained by potential flow theory. The uneven bottom caused by the submerged annular rippled breakwater was treated by the modified mild-slope equation (MMSE), and the constraint effect of the curved beam of the floating pier was transmitted through a hinge. The response amplitude operators (RAOs) of the floating pier were obtained. The effects of the curvature radius and stiffness of curved beam on RAOs of floating pier were analyzed, and the effect of the geometric parameters of the breakwater were investigated. The results showed that the responses of the floating pier in the surge and pitch directions were reduced by more than two orders of magnitude due to the constraint of the curved beam. In the construction of breakwaters, the ripple amplitude, length, and relative distance between the floating pier and breakwater need to be comprehensively considered. To lower the RAOs, the optimal relative distance was determined, which was related to the ripple amplitude and length.