الفهرس 
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Abstract
This thesis deals with the dynamic analysis of multistory reinforced concrete buildings and aims at finding a simple approach for evaluating the fundamental period of vibration of such buildings.
A comparative study for previous formulae in different codes and researches has been presented.
A parametric study is made on multistory-multibay frames with different properties to investigate the influence of the different parameters affecting the fundamental period of vibration of such frames.
Two formulae for the calculation of the fundamental period have been developed for the cases of frames of uniform properties and of frames of different member properties, and of different bay lengths. One of the two formulae are based on calculating the fundamental period of a unit frame which can be chosen arbitrarily from the different units of the frame under consideration. The formulae account for the effect of the frame height, width, members properties and frame mass on the magnitude of the fundamental period.
A verification study has been conducted on the proposed approach and formulae using different models with variable properties.