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In this paper, a FE-(FE-HE) procedure is implemented for dynamic analysis of concrete arch dams, in the frequency domain. The technique relies on the finite element method for the discretization of the dam body and the near field of the reservoir, while the far field is handled by the fluid hyper-element. It should be emphasized that the usual method for calculating the required impedance matrix of the above mentioned fluid hyper-element is dependent on the solution of a complex eigen-value problem for each frequency, which is very time-consuming. This problem was remedied by an efficient technique in a previous study which greatly reduces the computational time. The present approach is a modification of that procedure trying to have similar efficiency without losing the accuracy in any cases, contrary to the previous study. Furthermore, a previously developed special purpose program is enhanced based on this new method and the response of the Morrow Point arch dam is studied as an example

Analysis of dam—reservoir interaction by employing the modified-efficient fluid hyper-element