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FLEXURAL COMPARISON OF THE ACI 318-08 AND AASHTO LRFD STRUCTURAL CONCRETE CODES by Nathan Jeffrey Dorsey There are two prevailing codes utilized during the design of structural concrete members in North America, ACI 318-08 and AASHTO LRFD. Each takes a unique approach to achieve the same result, a safe working design of a structural concrete section; however there are fundamental differences between the codes regarding the calculation of member properties. The purpose of this paper was to investigate these differences between codes encountered during the calculation of flexural strength or moment capacity of a section. This study focused on the code's influence during the classical approach to analysis of a shallow reinforced T-beam and the strut and tie model method as applied to a series of deep beams with openings. Parametric studies were conducted using software developed by the author specifically for this purpose. It was concluded that both codes provided similar and safe results regardless of the very different approaches to solution taken by each. ACKNOWLEDGEMENTS I would like to thank Dr. Akthem Al-Manaseer for his patience and support during this process. Dr. Al-Manaseer gave me full academic freedom during the course of this research and by doing so provided me with a tremendous learning experience that went far beyond reinforced concrete. And I would especially like to thank my lovely wife Jaya for always believing in me and for making sure that I always believed in myself.

Flexural comparison of the ACI 318-08 and AASHTO LRFD structural concrete codes