الفهرس 
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Abstract
An analysis procedure for the evaluation of the seismic response of earth dam - finite reservoir systems was presented in this thesis. The analysis was carried out in the time domain and a substructure approach was used. A standard displacement finite element formulation is used for the fluid - structure system. A response time history analysis was carried out for the Taft ground motion 1952 to a hypothetical earth dam, The earth dam material was represented by the two - phase coupled fluid - solid model of saturated soils based on Biot’s dynamical theory of saturated porous solids. A displacement approach was used to formulate the fluid domain, thus displacements are the only response variable at the global level. This allows assembly of the fluid elements with displacement elements for the structure and leads to symmetric equations of motion for the coupled system in terms of nodal displacements and is solved by a time integration method.
A computer program was written to Carry out the required operations of this procedure and to evaluate the response of different points on the earth dam during a given seismic excitations. The program was written for two dimensional elements in plan-strain; triangular and quadrilateral elements can be used in representing the continuum.
A parametric study have been done to evaluate the effects of the studied parameters on the response of the system, three different ways was adopted to explain the response of the system to the different parameters. In addition to the time history of the displacement of certain points on the dam, the absolute average displacement was described on a vertical section through the crest of the dam, a horizontal section through the dam beside its base, and on the upstream face of the dam to represent the variation of the response under the effect of one case. In the third way, the results of altering the studied parameter on the response were combined for each point, summarizing the effect in one figure. The results were compared to those from previous investigation.
The effect of the following parameters was discussed:
I) Dam material stiffness for both homogenous dam and non-homogenous dam, for
the non-homogenous dam the effect of different dam’s zone material were declared .
II) Crest width
111) Dam’s sides slopes
IV) Dam height.