Dynamic Response of Bridge Pier under Combined Earthquake and Wave–Current Action

TLDR

The study investigates the dynamic response of a circular bridge pier under simultaneous earthquake and wave–current loading. Analytical solutions are derived using diffraction and radiation wave theories, treating the pier as a cantilever beam, and the influence of hydrodynamic, wave, wave–current interaction, and surface wave conditions on its dynamic response is examined. The findings provide data useful for engineering practice and future research.

Abstract

A study of the dynamic response of a circular bridge pier forced simultaneously by earthquake and wave–current actions is presented. On the basis of diffraction wave theory, the analytic solution for the diffraction of incident waves with uniform current on a circular pier is given. On the basis of the radiation wave theory, the analytic solution for the hydrodynamic pressures on a circular pier induced by combined earthquake and wave–current action is obtained. Further, the solution for the dynamic responses of the pier under combined earthquake and wave–current action is obtained by treating the pier as a cantilever beam governed by beam theory. Last, the effects of hydrodynamic force, wave force, wave–current interaction, and surface wave condition on the dynamic responses of the pier are investigated. The results may be used for engineering practice and further research.