Slab effects in SMRF retrofit connection tests

A series of six full-scale subassemblages were tested to investigate dogbon e and haunch retrofits for pre-Northridge steel moment connections. Tests i ncluded matched pairs of specimens, one bare steel and one including compos ite slab. Data were collected to evaluate the influence and behavior of the concrete slab. Results that emphasize the influence of the composite slab on connection behavior and specific comments on the slab response are prese nted. The presence of a composite slab corresponded to higher-achieved over all plastic rotations and higher-peak attained moments. Existing estimates of composite beam capacity overestimated the specimen strengths in positive moment. Shear stud failures were observed, raising concerns about the capa city of shear studs under severe reversed cyclic loading.