Ansys is a finite element computer program capable of performing static, dynamic, heat transfer, fluid flow, and electromagnetism analyses. Ansys is a very powerful and impressive engineering tool that may be used to solve variety of problems. The concrete gravity arch dam of "Brezina" is located in El Beyadh at the west of Algeria. It transmits part of its actions to both sides of the valley through arching effect, whereas the bottom part acts on the foundation. The dam is 60 m high, its maximum arch length is 78.5 m and its thickness varies from 5m at the crest to 36.3 m at the foundation level.