The results of a modal analysis of the fish-belly flap type of steel water gate are presented in the paper. The analysis was conducted for a detailed numerical model of the structure using four-node quadrilateral shell elements. The study was focused on the examination of the influence of positioning of the flap gate and hydrostatic pressure of water on the eigenvalues and eigenmodes of the structure. The results of the study indicate that the difference between the frequency values for different positions is relatively low due to interaction of two opposed factors (change in the hydrostatic pressure value and change in its orientation).
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