Slab Effects in SMRF Retrofit Connection Tests.
Slab Effects in SMRF Retrofit Connection Tests.
(1264 K)
Civjan, S. A.; Englehardt, M. D.; Gross, J. L.
Journal of Structural Engineering, Vol. 127, No. 3,
230-237, March 2001.
Keywords:
slabs (members); connections; earthquake engineering;
earthquakes; frames; rehabilitation; cracking
(fracturing); steels; stress (mechanics)
Abstract:
A series of six full-scale subassemblages were tested to
investigate dogbone and haunch retrofits for
pre-Northridge steel moment connections. Tests included
matched pairs of specimens, one bare steel and one
including composite 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 presented. The
presence of a composite slab corresponded to
higher-achieved overall 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 capacity of shear
studs under servere reversed cyclic loading.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899