The study is an investigation of the earthquake damage response of the concrete gravity dam.

The material behavior is based on the damage mechanics, it has been implemented in a finite element program

Severe damage was found in the form of horizontal cracking observed on both the upstream face of the upper part of dam monoliths

The nonlinear dynamic analysis of Koyna dam is performed using the concrete model with isotropic damage in local approach.

We show the time history graphs of horizontal and vertical displacement at the dam crest.