الفهرس 
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Abstract
Research in the field of earthquake phenomenon is currently gaining an increasing interest to obtain a full understanding of its aspects, and develop a structural design code for minimizing earthquakes risks. The risks of earthquake can have a wide spectrum of casualties including damage of structures such as dams , nuclear reactors, factories, etc. which result in a great negative social and economical impact on any nation encountering the unfortunate mishap of being hit by an earthquake.
This thesis present an analysis of the dynamic behavior of structures under the effect of vibrations due to earthquakes. The objectives of the presented research are categorized as follows :
-predicting earthquake excitation ” intensity and magnitude”.
-suggesting preventive precautions for structures, before facing unexpected casualties of an earthquake.
-developing a technique for reducing the vibration impact of structures due to earthquek by providing proper isolation of the structure.
-providing computer models of different structures to study the effect of different parameters in controlling structure vibration.
The results showed that the existence of the active mass damper reduced the maximum displacements of the floors significantly. Reductions reaching 70% of the original floor displacements.