SeyedRasoul MIRGHADERI - Assistant professor, Department of civil engineering of Tehran University, Tehran, Iran
Nasrin BAKHSHAYESHEGHBALI - Ph.D. Student, Department of civil engineering, Tehran, Iran
Mohammad Mehdi AHMADI - Lecturer, Department of civil engineering of Ilam University, Ilam, Iran

Composite structural systems , which consist of reinforced concrete columns and steel (RCS) beams, provide substantial savings in mat erial cost, increase structural damping and later al stiffness through RC columns, and increase energy dis sipation capacity through steel beams. The lo ad transfer mechanisms between RC column and steel beam may be very complicated, due to different material properties of columns and beams. In this study, a new Through-Column-Type Joint is proposed that uses different ways for developing a reliable load pat h. The joint is reinforced by cover plates and a vertical plate passing through the column, and beams are connected to the vertical plate named the Th rough Plate. This study employed finite-element analyses of the mentioned connection to investigate the structural performance and the stress transfer mechanisms. It w as found that the initial stiffness and energy dissipation of the new details were increased and strength degradaation was decreased under cyclic loading compared with previous details. The study further showed that the u se of through plate is effective in enhancing the structural performance of the joints.

Moment Connection, Finite Element Analysis, Composite Structu res, Stress Transferring Mechanisms, RCS