8_vol3_929
DESCRIPTION
Damping is a phenomenon of energy dissipation that opposes free vibrations of asystem. Like the restoring forces, the damping forces oppose the motion, but theenergy dissipated through damping cannot be recovered. A characteristic feature ofdamping forces is that they lag the displacement and are out of phase with themotion. Damping of soil includes two effects-geometric and materialdamping.Geometric, or radiation, damping reflects energy dissipation throughpropagation of elastic waves away from the immediate vicinity of a foundation andinelastic deformation of soil. It results from the practical