R. Attarnejad, F. Kalateh,
Volume 10, Issue 1 (3-2012)
This paper describes a numerical model and its finite element implementation that used to compute the cavitation effects on
seismic behavior of concrete dam and reservoir systems. The system is composed of two sub-systems, namely, the reservoir and
the dam. The water is considered as bilinear compressible and inviscid and the equation of motion of fluid domain is expressed
in terms of the pressure variable alone. A bilinear state equation is used to model the pressure–density relationship of a cavitated
fluid. A standard displacement finite element formulation is used for the structure. The Structural damping of the dam material
and the radiation damping of the water and damping from foundation soil and banks have been incorporated in the analysis. The
solution of the coupled system is accomplished by solving the two sub-systems separately with the interaction effects at the damreservoir
interface enforced by a developed iterative scheme. The developed method is validated by testing it against problem for
which, there is existing solution and the effects of cavitation on dynamic response of Konya gravity dam and Morrow Point arch
dam subjected to the first 6 s of the May 1940 El-Centro, California earthquake, is considered. Obtained results show that impact
forces caused by cavitation have a small effect on the dynamic response of dam-reservoir system.