A Finite Elements 3D analysis including the soil interaction has been developed. The analysis includes a modal analysis studying the soil (lowest frequencies of the system) and residual (modes resulting from perturbations at the nodes of application in the directions of the forces).
A study of the forced vibration in the frequency domain has also been performed, applying the rotating components centrifugal forces depending on their operating speed.
Peak stress results in concrete have been obtained as well as the stress increase in the reinforcement bars. Finally, the velocity amplitudes of the bearing supports have been compared to the recommended values by the original designers of the foundation and the reference standards.
Rotors masses: 180 - 166.4 kN/g (turbine & generator)
Balance grade: Gr 6.3
Operating frequency: 50 Hz
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