Paper Details

Dams have played a vital role in regulating water flow to cater to the needs of irrigation, for humanconsumption for harnessing hydroelectric power, as well as control of floods. Some of the important aspects that mayaffect the response of gravity dams subjected to earthquakes have been recognized through the dam-reservoir-foundationinteraction. Modal characteristics such as natural frequencies and mode shapes undergoes modifications due to theseinteraction. The influence of foundation flexibility on the dynamic response of gravity dam is also significant. Modalanalysis is a simple way to find the various periods at which structure will naturally resonate. These periods of vibrationare very important in earthquake engineering. The present study aims to determine the effects of dam-reservoir-foundationinteraction on modal behaviour of gravity dam. The effect of foundation flexibility on the modal period is also studied.Relation between modal period, height and base width is also obtained. Modelling is done using ANSYS 16.2 computerprogram. The analytical results obtained from 2D finite element modal analysis of concrete gravity dam show that modalperiod of dam is functions of its overall height and also dam- reservoir-foundation interaction and foundation flexibilityhas a significant influence on the modal periods and mode shapes. So, its consideration is essential while designing thegravity dam for safety, reliability and quality

Anjana Ravindran, Boby Jacob, “EFFECTS OF DAM-RESERVOIR-FOUNDATION INTERACTION ON MODAL BEHAVIOUR OF GRAVITY DAM”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 5, Issue 4, pp. 1544-1552, April 2018.