Numerical effect of seismic force on a medium arch dam

Abstract The dam is considered a huge structure that has multiple purposes in the life of human. most important role production electricity, and storage quantity water. Therefore, it very to be vigilant studies made for it. Lebanon indeed been designated as seismicity country. However, number dams increasing due several natural consideration. Mseilha an executed medium arch dam, which faced problems during after construction. initial problem seismic force. This force dangerous any structure, especially dam. It could increase existing concrete stresses. These stresses will cause development cracks all along Once shows cracks, its resistance decrease, become more vulnerable external effects. Several were fortify make resistant To show major effect this force, two methods ‘pseudo-static’ ‘response spectrum’ applied evaluate performance these methods, modelled using finite element software. obtained results importance appropriate model design such without taking model.