Seismic analysis of concrete arch dams considering hydrodynamic effect using Westergaard approach

Earthquake response of arch dams should be calculated under strong ground motion effects. In this study, threedimensional linear response of an arch dam is investigated. The hydrodynamic effect of water is taken into account with Westergaard approach. Different ground motion effects and also foundation conditions are considered in the finite element analyses. For this purpose, the Type 3 double curvature arch dam was selected for numerical examples. All numerical analyses are carried out by SAP2000 program for full reservoir cases. According to numerical analyses, maximum horizontal displacements and maximum normal stresses are presented by dam height in the largest section. These results are evaluated for five different elastic foundation conditions. The selected foundation conditions of the all models have different sandstone material parameters. Furthermore, near-fault and far-field ground motion effects on the selected arch dam are taken into account by different accelerograms obtained from the Loma Prieta earthquake at various distances.

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