Eccentricity based analysis of confined reinforced concrete circular columns


Show simple item record Abd El Fattah, Ahmed Mohsen 2008-12-22T21:40:02Z 2008-12-22T21:40:02Z 2008-12-22T21:40:02Z
dc.description.abstract The development of column interaction diagrams for unconfined concrete is a standard analysis procedure. However, the need to develop analysis tools for the actual ultimate capacity of columns is evident. Modern codes and standards are introducing the need to perform extreme event analysis. In previous studies, various models were implemented to assess the ultimate confined capacity of columns under concentric axial loads. On the other hand, the effect of confinement in case of the eccentric axial load and the corresponding bending moment are not investigated in such models. So it is demanded to relate the strength and ductility to the degree of confinement utilization in a new model. The more the eccentricity the less the confinement engaged till the effect of the confinement vanishes at pure bending. Accordingly, the ultimate confined strength and the maximum strain range between the fully confined values (at zero eccentricity) and the unconfined values (at infinite eccentricity) depending on the level of eccentricity. Radial loading with constant eccentricity is followed in the nonlinear moment of area concept that considers the finite layer procedure and the secant stiffness approach, to achieve equilibrium points up to failure. Three different comparisons are made to ensure the accuracy of the analysis. The first is to compare the unconfined analysis results with the well-known software (CSI-Section Builder). Secondly, the ultimate capacity of the confined section is compared with experimental data. Finally, the new eccentricity model is compared with the widely used Mander model, which is applicable to concentric columns, to examine the accuracy versus safety. en
dc.description.sponsorship Kansas Department of Transportation en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject Concrete en
dc.title Eccentricity based analysis of confined reinforced concrete circular columns en
dc.type Thesis en Master of Science en
dc.description.level Masters en
dc.description.department Department of Civil Engineering en
dc.description.advisor Hayder A. Rasheed en
dc.subject.umi Engineering, Civil (0543) en 2008 en December en

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