Three series of vibration tests at different water levels are performed for an existing arch dam in Austria. Then the resonance frequency and resonance mode of the dam-reservoir-system are computed. Investigation is completed by solving an inverse problem using the data obtained from forced vibration tests. The solution strategy is verified by studying the dynamic response of simple structures like beams and plates with fluid interaction effect taken into account, since the analytical results of the modal properties of this structures were available for comparison. Efficient and accurate solution strategies are developed already for plate-fluid systems for compressible water with finite reservoirs, and beam-fluid systems for incompressible water with infinite reservoirs. In this paper the strategies are extended to analyze the dynamic beam-fluid interaction problem with compressible water. The hydrodynamic pressure of compressible water in a natural reservoir is calculated by the boundary element method. The results derived by solving the inverse problem are compared with the exact analytical response.

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