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El-Centro earthquake Record
HYDRODYNAMIC ANALYSIS OF CONCRETE GRAVITY DAMS SUBJECTED TO GROUND MOTION
Bakenaz A. Zedan Associate Professor, Irrigation and Hydraulic Engineering Department, Faculty of Engineering,
Tanta University, Tanta, EgyptRef. E-mail: drbakenaz@yahoo.com
Problem Statement Fluid Structure Interaction Formulation
+ (3)
Governing Equation& Boundary Conditions
on ГR (5)
on ГB (6) P=0 on Γf (7)
. n on ГI (8)
El-Centro earthquake Record
Modal Analysis of Dam-Reservoir System
Figure 5b: Deformed Shape of Coupled System for First and Forth Modes
5a: Natural Period in the First Five Modes
Dynamic Analysis of Dam-Reservoir System
MAIN CONCLUSIONS• The Dam-Reservoir interaction effect on the responses of a selected concrete gravity dam subjected to ground
motion excitation is investigated in this study. • The deformations of the dam concrete remain in the elastic range for the assumed stress-strain relationship. • Various responses are extracted using the conducted finite element model utilizing ANSYS code. • Results from modal analysis demonstrate that considering dam-reservoir interaction in analysis affect
significantly both the natural period as well as dam deformation shape.• Results from dynamic analysis demonstrate that considering dam-reservoir interaction in analysis affect
significantly the seismic response of the gravity dam at its heel where maximum responses prevail with respect to responses at dam toe.
• The time history of hydrodynamic pressure exerted on the upstream face of the dam, crest displacement and stresses respond significantly to the coupled fluid-structure system.
• With respect to the feasibility of ANSYS feature in simulating the coupled dam-reservoir interaction effects on gravity dam seismic response it proves to be appropriate enough.
Verification of Model
Finite Element Model
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