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NEES Project Warehouse

Collaborative Developments for Seismic Rehabilitation of Vulnerable Braced Frames
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Experiment-18: NCBF1-R4: UW Non-Seismic Concentrically Braced Frame (NCBF) with Welded Continuous Shear Tab and Rectangular HSS Brace In-Plane Buckling Retrofit
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DOI:10.4231/D3XK84R3C
Experiment Type: Large Scale
Description: This specimen consisted of a single-bay one-story concentrically braced frame with single-diagonal bracing. The frame was intended to be representative of a rehabilitated non-seismic concentrically braced frame (NCBF) with continuous welded shear tab connections at brace-beam-column intersections. The connection used in NCBF1 was rehabilitated for in-plane buckling by welding a knife plate to the existing gusset plate. This rehabilitation was slightly different than that used in NCBF1-R4 in that the knife plate did not extend as far back into the connection. This was intended to eliminate deformation demands on the gusset plate welds associated with out-of-plane plate bending. Also, a highly ductile rectangular HSS was used to ensure in-plane buckling about the bracea??s weak axis. Since the existing gusset plates and shear tabs were used, some deficiencies with respect to the 2010 AISC Seismic Provisions remained. Connection deficiencies included knife plate yielding, gusset plate yielding of the Whitmore section, gusset plate shear yielding, gusset plate-to-beam and -shear tab weld fracture, brace net section rupture, gusset plate block shear rupture, and gusset plate buckling. The specimen was loaded quasistatically through a load beam bolted to the north beam using a reversed cyclic increasing amplitude loading protocol. Traditional physical sensors and optical sensors were installed on the specimen. Portions of the specimen were whitewashed to detect yielding.
Dates: December 10, 2013 - December 10, 2013
Facility: University of Washington, WA, United States
Equipment:
Specimen Type: Braced Frame
Material: Beams Beams (view)
Columns Columns (view)
Brace Brace (view)
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Sensors: Optotrak
Strain Gauges and Potentiometers
Drawings:
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Data:
Trial ( ? ) Repetition ( ? ) Interactive ( ? ) UnprocessedConvertedCorrectedDerived
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Tags (keywords):
  1. Full scale testing
  2. NCBF
  3. quasi-static
  4. Braced Frame
  5. connection
Cite this work:
Ryan Ballard, Charles Roeder, Dawn Lehman, Jeffery Berman (2015). "NCBF1-R4: UW Non-Seismic Concentrically Braced Frame (NCBF) with Welded Continuous Shear Tab and Rectangular HSS Brace In-Plane Buckling Retrofit", Network for Earthquake Engineering Simulation (distributor), Dataset, DOI:10.4231/D3XK84R3C