The purpose of this study is to examine whether and under what condition, the inclusion of hydrodynamic pressure would affect seismic response of waterfront retaining walls. The soil retaining structures are idealized either as deformable beams of uniform cross-section on rigid foundations or as rigid bodies resting on rotationally deformable foundations. The hydrodynamic pressure is governed by the wave equation. The water is assumed of constant mass density, inviscid, but slightly compressible, and it's motion is irrotational. We assume that the soil mass is unsaturated, undamped, and isotropic; it remains in the linear elastic range, satisfies the plane strain condition, and is continuously in contact with the wall at the soil-structure interface during earthquakes. Analytical results are derived and numerical results are obtained and presented graphically for various values of the parameters controlling the behavior of the soil, structure and water. It is found that under various conditions, effect of hydrodynamic pressure on the response of coastal retaining structures should not be ignored.
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