Abstract
The detail of dynamic response of an intake tower in a reservoir is not enough clarified. Its base lies deeply below the reservoir water surface, so that it is difficult to identify the base exciting wave and to measure the ground motion. The earthquake acceleration records have been kept at the top of the intake tower since April 1995. The dynamic response of a tower model was analyzed on the basis of the seismic waves observed by the seismographs which were set in the foundation of an embankment dam apart from the tower.
Following two models were presented in this study; One is R-model which is a cantilever on rigid base subjected to bending and shearing forces, and the base causes rocking vibration. The other is F-model which is a cantilever directly stood on foundation base.
The dynamic response of these modes were computed based on the resulting vibration modes obtained for eigen value analysis.
Due to the difference in the geographical locations of both the dam and the tower, the accuracy of the proposed models were evaluated based on the rms values of their respective power spectrum density functions. A useful information for designing an earthquake resistant intake tower was presented by calculating the maximum top displacement and section forces.
