Published Paper Details:

Response of concrete gravity dam to earthquake is a complex phenomenon and reducing the effects of earthquake on these structures has always been an important concern .One such classic example is the Koyna Nagar Earthquake of 1967 which affected the functioning of Koyna Dam in India. This study evaluates the behavior of Koyna dam to different real ground motion accelerations and its implications by adopting dam-reservoir-foundation system. Response parameters such as displacement, acceleration, principal tensile and compressive stress at salient locations of the dam in response to past five major earthquakes ranging from low to high frequency content are investigated and compared. Development of tensile stress on the dam structure is the primary safety concern during an earth quake than compressive stress. Modified cross section is suggested to reduce the tensile stress at heel and slope changing points up to 25% and 35%respectively, the critical locations to avoid failure of the structure.