Simplified Expression of Hydrodynamic Pressure on Deepwater Cylindrical Bridge Piers during Earthquakes: Fid-Bau Portal

Simplified Expression of Hydrodynamic Pressure on Deepwater Cylindrical Bridge Piers during Earthquakes

Zhang, Huidong

AbstractThe expressions of hydrodynamic pressure based on the radiation wave theory are too complex to be conveniently utilized in engineering applications; therefore, a simplified extraction that is accurate and concise for calculating the hydrodynamic effect on deepwater bridge piers is highly desirable for seismic analyses. With a further comparison between the elastic vibration and rigid motion of cylindrical piers submerged in water, the hydrodynamic pressure of the cylindrical piers can be approximately acquired in terms of the added mass caused by rigid motion based on the linear radiation wave theory. A simplified formula for the hydrodynamic pressure is proposed by elaborate data fitting, in which the section radius of the pier and the water height are the main parameters. The accuracy of the proposed formula is validated by the radiation wave theory and the potential-based fluid-element method. Results prove that the simplified expressions are not only accurate but also convenient in calculating the hydrodynamic pressure of cylindrical piers with a wide range of geometries. The applicability of the Morison equation and the Goto-Toki formula is also presented.