Seismic behavior of composite moment resisting frame systems

The objective of this research program was to investigate the seismic performance and constructability of composite moment resisting frame systems consisting of reinforced concrete columns with embedded steel erection columns and composite steel beam---reinforced concrete stab sections (referred to as RCS frame systems). The framing system investigated is intended for use in low-to-mid rise buildings where moment resistance at the beam---column joint is required in both orthogonal directions.; Six beam---column subassemblage specimens were constructed and tested under quasi-static reversed cyclic loading in both orthogonal framing directions consecutively. The specimens differed in the beam-column joint details used, consisting of face bearing plates, band plates, joint plates, and bolted connections. One of the specimens represented an exterior beam-column joint configuration, while the remainder were interior configurations.; A macro-model analytical investigation of the subassemblage tests was undertaken. Inelastic quasi-static analyses were used to calibrate element behavior (strengths and stiffnesses and hysteretic parameters for strength deterioration and stiffness degradation) to correlate with the experimentally measured subassemblage behavior. These calibration studies, along with the results of the experimental testing, were used to develop design recommendations for composite RCS frame buildings.; Inelastic dynamic time-history analyses of a trial six-story RCS frame building were performed. The results of these analyses were compared to Code specified performance levels to quantify the building's seismic behavior.; It was concluded that the composite moment resisting frame system studied possesses excellent seismic performance and may be a viable alternative to traditional reinforced concrete and structural steel framed buildings.