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Abstract
Gravity damis considered one of the most important massive concrete structures which dependon its own weight to resist the external loads. Partial or full failure of this structure produces proper damages of the society and sometimes death for humans. Nowadays the construction of the concrete dams or rehabilitate work for existing dams are required the creation for the development of modern tools and methods of the numerical analyses considering the dam-reservoir-foundation interaction. Moreover the transient simulation of the behavior for this structure is considered an important issue in structural dynamics. In order to achieve the objectives of this thesis,many procedures are executed and explained as follow: 1.Comparisons between 2-D and 3-D F.E. models results are executed. 2.Studying the effect of dam-reservoir-foundation interaction through analyses. 3.Review the influence of the stiffness changes for the longitudinal direction of the dams through the earthquakes. 4.Produce GUI for executing analyses and structural optimization for the concrete dams{u2019} cross-sectionsconsidering several types of loading