الفهرس 
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Abstract
Columns are structural elements used primarily to support compressive loads. It
should be design to resist axial compressive forces and moments due to lateral loads.
The ECP-203 proposes two methods of analysis for sections subjected to eccentric
forces (ultimate strength method (USM) and working stress method (WSM)). This
research aims at studying the difference between the two methods of analysis. Sixteen
rectangular sections were analysed using USM and WSM. All sections were also
analysed using ACI-318 Code.
The research presents a comparison between ultimate strength design method and
working stress design method proposed by the Egyptian code for concrete structures.
Also the research includes a comparison between interaction diagrams for rectangular
reinforced concrete section using both Egyptian Code ECP-203 and ACI-318. The
comparison showed that the working stress method is more conservative than ultimate
strength method especially at in the range of e/t (eccentricity / section height) varies from
0.05 to 1.0.
The comparison between ACI and Egyptian Code showed that the ACI is more
conservative than ECP especially at large values of e/t = 0.45 to 1.50. However, the
Egyptian Code results are more conservative when e/t is less than 0.45 for the studied
cases.