Abstract
The dynamic response of an idealized dam-foundation system to harmonic vibration is computed by the modal analysis tequnique. The system is assumed elastic in the analysis. The frequency response functions are used to investigate the effects of dam-foundation rock interaction and the following response properties of the dam are obtained; ie, the resonant frequency of the dam decreases and the horizontal acceleration at the crest decreases, as the elastic modulus of the foundation rock decreases. The maximum response of vertical normal stress at the upstream edge of the dam is, however, not so influenced by the dam-foundation rock interaction.
