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Abstract
The main purpose of this thesis is to study the behavior of slender reinforced concrete colunms existing in sway and non-sway structures. The stability of slender columns was studied and the required limits for the lateral bracing were determined. A commercial Finite Element program ANSYS 8.0 was used to perform buckling analysis, linear analysis, and geometric nonlinear analysis for the different frame structural models. Many variables are studied in this thesis affecting the stability of the structures. These variables are as follow: -1- The stiffness of beam connected the slender column at top. - 2- The stiffness of the bracing columns. - 3- The number of bays in the structure model. - 4- The number of stories in the structure model. - 5- The horizontal load applied to the structure. All the results obtained in this study were compared to the available methods included in the different building codes and also to the methods suggested by other researchers. The results obtained from the theoretical work presented in this thesis indicate that the minimum value of the bracing limit, required to restrain the slender column against side- sway, depends on the stiffness of the connecting beams, number of stories and number of bays. The required bracing limit decreases with increasing the beam stiffness and with increasing the number of bays. However, the required bracing limit increases with the increase of the number of stories in the structure. The results also reveal that increasing the degree of lateral bracing reduces the loss in the ultimate axial capacity of reinforced concrete slender columns and thus, slenderness effects may be neglected.