Fluid structure interaction in dam-reservoir systems under dynamic actions (Master thesis)

This thesis studies the behavior of dam-reservoir systems under seismic action. Due to the interaction that takes place between these systems it's impossible to analyze the dam on its own, the reservoir doesn't act as a external load alone but it changes the dynamic properties of the dam too. An approximation is studied and programmed in the thesis, this approximation is based on the principle of dynamic substructuring. The system is formulated in the frequency domain.

The program was written on Mathematica.

The following simplifications are introduced in order to derive the method:

• Vertical upstream

• Reservoir of constant depth

• Only the horizontal components of the earthquake are considered

The structure is discretized using the finite element method whereas the fluid is treated analytically.

KOyna dam example

The approximation method was then used to analyze the behavior of the dam under the effect of the earthquake. The stress peaks around the same elevation where the cracks developed in during the earthquake.