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The prediction of the fundamental period and damping ratio of bridge pier-foundation system is of importance in seismic design of bridges. An analytical approach, based on linear simple superstructure of mass and height supported by a rigid embedded foundation with mass and mass moment of inertia ha ƒL[ƒ[ƒhi‰pjF dynamic soil structure interaction, seismic design of bridge ‹LŽ–‹æ•ªF ˜a•¶˜_•¶i“Še˜_•¶j ‹æ•ª @@@@˜_•¶W