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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��[ƒh�i‰p�j�F dynamic soil structure interaction, seismic design of bridge ‹LŽ–‹æ•ª�F ˜a•¶˜_•¶�i“Š�e˜_•¶�j ‹æ•ª �@�@�@�@˜_•¶�W