Investigation into the effect of bed stiffness on seismic performance of concrete gravity dam under far and nearfield earthquakes

Today hydraulic reservoir structures are one of the most significant structures over the world and, on the other hand, have become of great importance because of current droughts, particularly in the Middle East. Concrete dams are noteworthy superstructures amongst these structures and their construction and maintenance involve intensive research. In this study, the effect of bed stiffness on a concrete gravity dam is examined under far and nearfault ground motions. This study is conducted through the numerical modeling of Pine Flat concrete dam as a case study via Abaqus software, the import of 6 far and nearfield accelerograms and the investigation into the effect of 3 stiffness ratios. The results indicate that the stiffness ratio of 1 has a more reasonable effect, for which the response of structure is more logical and appropriate.