Girma, Zerayohannes (Prof.)Mahlet, Wondwosen2022-03-152023-11-112022-03-152023-11-112022-01http://etd.aau.edu.et/handle/12345678/30577Hybrid structural frame systems, which combine the use of reinforced concrete and steel, are becoming a viable solution for high-rise buildings. But like all innovative solutions, this comes with the problem of connecting the reinforced concrete beam with these composite columns. In this study, the structural performance of concrete-encased composite columns and reinforced concrete beam joints for selected connection types are evaluated. The main objective of this research is to investigate the two common types of connection, passing through type and wing plate type, and the implementation of a combination of these connections at one joint on an interior steel-reinforced concrete composite column to reinforced concrete beam joint under repeated reverse cyclic loading. Furthermore, the effect of column axial load variation for the three connection types has been investigated under cyclic loading. Beam-column joint specimens are obtained from a published experimental study. A non-linear finite element model is then developed using a three-dimensional software, DuCOM-COM3, and validated using the experimental result. An interior steel-reinforced concrete composite column to reinforced concrete beam joint using the passing through and wing plate connection type has been validated and used as control specimens. A comparative study is conducted between the control specimens and the integrated type specimen. In addition, a total of 18 specimens are simulated by varying column axial load on the three connection types. The analytical result showed that the integrated type specimen exhibits increased ultimate shear capacity and ductility from the control specimens. The increase of column axial load up to 20% of the column capacity on the three connection types showed a slight enhancement in the ultimate storey shear capacity. However, the ultimate storey shear capacity decreased as the axial force increased because of the adverse effect of axial forces on the lateral stiffness of the column. Moreover, an increase in column axial load ratio showed a reduction in the ductility performance of the joints. For the wing plate type specimen, an increase in column axial load ratio showed a determinantal effect on the stiffness and the energy dissipation capacity of the joint.en-USBeam-column jointSteel reinforced concrete columnColumn axial load ratioDuCOM-COM3Cyclic loadingHysteretic responseStory shear capacityDuctilityStiffnessEnergy dissipation capacityThesis