- Author
-
Civjan, S. A.
|
Englehardt, M. D.
|
Gross, J. L.
- Title
- Slab Effects in SMRF Retrofit Connection Tests.
- Coporate
- University of Massachusetts, Amherst
University of Texas, Austin
National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
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)
- Identifiers
- estimated and attained moment capacities; ratio of attained strength to estimated plastic moment capacities; Steel Moment Resisting Frames (SMRFs); shear stud failures; specimen strength; flange strains; neutral axis location; crack patterns; slip of composite slab; estimate of compressive slab stress; stability of beam
- 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.