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.