An analytical solution for a fluid-structure system regarding dam-water system is presented in this paper. The analytical response is used to evaluate the accuracy of the finite element method through a numeric example with especial consideration of high frequencies of excitation. In the example, the structure is modeled as a cantilever beam with rectangular cross-section including only shear deformation and the reservoir is assumed semi-infinite rectangular filled with compressible water. It is observed that finite element results deviate from the analytical responses in relatively higher frequencies which is the case for the near field earthquakes.

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