الفهرس 
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Abstract
This thesis presents the results of experimental and theoretical studies of high strength reinforced concrete beams subjected to flexure. The ultimate limit state method was employed in design.
An experimental program to test nine reinforced concrete rectangular beams has been introduced. Tests on all specimens were mainly intended to cover the ranges of static loading up to failure, taking into consideration the following parameters, compressive strength of concrete, percentage of tension steel and percentage of compression steel. Test results were recorded and analyzed as well as conclusion and recommendations were reported.
Atheoretical work was done using the well Known non linear finite element Ansys Release 11Computer Program. The experimental models and more structural variable were not possible to be included in the experimental program such as span -to-depth ratio, shear span -to-depth ratio and percentage of tension steel were analyzed. This program was used to study the appearance of crack and crushing of concrete. Also to predict the ultimate load capacity and deflection at any stage of loading.
Analytical study was conducted using stress, block models for different codes to calculate the ultimate moment capacity of the experimental and theoretical models. The results show that stress, block models proposed by different codes of practice underestimate the ultimate moment capacity of the rectangular cross section. Also the calculation of deflection at serviceability limit state has been carried out using the simplifying assumption of Egyptian code provision (ECP).