Effect of Dam Reservoir Interaction on Response of Dam Subjected to Dynamic Load

Abstract

Gravity dams are solid structures that maintain their stability against design loads due to their geometric shape, mass, and material strength. In access to the static water pressure, the dam undergoes dynamic forces from the reservoir when the system is subjected to earthquake ground motion. When the structure and the fluid are placed alongside and affected by the same base acceleration, fluid, and structure interaction problem becomes important and it causes changes in responses of both of these parts. The available literature review shows that most of the analysis work is done to study the dynamic effect on dams but reservoir dam structure interaction is neglected. The Eulerian approach has been adopted to investigate the dynamic behavior and the interaction phenomenon of the dam–reservoir system. The structures are modeled and analyzed using ANSYS WORKBENCH R.16 Software. The response of the dam structure subjected to excitation of the Koyna earthquake, 1967, is studied. An arbitrary section of gravity dam has been chosen for the extensive analysis such that it is an economic section and satisfies all the conditions and requirements of stability. The results of maximum hydrodynamic pressure, pressure contour, crest displacement; stresses are obtained by time history analysis for the Koyna earthquake, 1967, using ANSYS. The results obtained demonstrate that the dam reservoir interaction is significantly affected by the reservoir filled capacity when subjected to earthquake response.