Seismic behavior of composite RCS frame systems

This paper presents the results of an experimental investigation into; the seismic performance of a composite moment resisting frame system that consi sts of reinforced concrete columns (with an embedded steel shape for erecti on purposes) and composite steel beam-reinforced concrete slab sections. Qu asi-static reversed cyclic loading was performed on six two-thirds-scale su bassemblage specimens. Various detailing options were evaluated to provide full moment connection in both orthogonal framing directions at the beam-co lumn joints. With appropriate joint detailing, specimens exhibited a desira ble beam plastic hinge mechanism with stable hysteretic response. Composite beam sections maintained near full composite behavior beyond code based dr ift limits with good energy dissipation characteristics and were able to un dergo large plastic rotation magnitudes. This framing system may represent a viable alternative for low-to-mid-rise structures in high seismic risk zo nes.