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NEES Project Warehouse

International Hybrid Simulation of Tomorrow's Braced Frame Systems
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To compare experiments, please select at most four experiments from the experiment list below.

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  Experiment-1: HSS-01
Dates: October 15, 2004 - October 15, 2004
Description: This test specimen was subjected to 44 complete cycles. The inelastic action of the frame included buckling and yielding of the brace as well as weld cracking, limited yielding in the columns, and buckling of the column bases. The overall failure of...
Facility: University of Washington, WA, United States
Buckled HSS Brace

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  Experiment-2: HSS-02
Dates: November 03, 2004 - November 03, 2004
Description: This new elliptical clearance allowed for smaller, more economical gusset plate. In addition, a larger weld size was used to connect the gusset plate to the frame, because of cracking noted in specimen HSS-01.In addition to this, column stiffeners were...
Facility: University of Washington, WA, United States


  Experiment-3: HSS-03
Dates: December 13, 2004 - December 13, 2004
Description: This specimen was similar to HSS-02, except that HSS-03 used a larger β factor for Whitmore yielding that allowed the use of a thinner gusset plate. The purpose of this was to increase the likelihood of gusset plate yielding. This test specimen was...
Facility: University of Washington, WA, United States


  Experiment-4: HSS-04
Dates: March 15, 2005 - March 15, 2005
Description: The brace slot was reduced in order to decrease the buckling capacity of the gusset plate as well as improving constructability. This specimen was subjected to 35 complete cycles. The inelastic action of the frame consisted of buckling and yielding...
Facility: University of Washington, WA, United States


  Experiment-5: HSS-05
Dates: March 15, 2005 - April 29, 2005
Description: The design of this specimen resembled that of HSS-03 except that a smaller weld size was used to examine the alternate weld design approach which is explained in the HSS-05 Overview doccument. The resulting weld size from the gusset plate to framing...
Facility: University of Washington, WA, United States


  Experiment-6: HSS-06
Dates: June 14, 2005 - June 14, 2005
Description: Inelastic behavior of the frame included buckling and yielding of the brace, yielding of the gusset plates, beams, and columns, and ductile tearing of the welds. Brace fracture was the overall failure mode of the system and occurred during the tension...
Facility: University of Washington, WA, United States


  Experiment-7: HSS-07
Dates: July 08, 2005 - July 08, 2005
Description: A web doubler plate was welded to the top side of the web of the N beam at the load beam to minimize damage of the N beam at this location. Inelastic behavior of the frame included buckling and yielding of the brace, yielding of the gusset plates, beams...
Facility: University of Washington, WA, United States


  Experiment-8: HSS-08
Dates: August 18, 2005 - August 18, 2005
Description: The weld size was increased to 1/2-inch in comparison to Specimen HSS-05 (5/16-inch), because it was believed that the smaller gusset plate size would lead to increased deformation demands on the welds. Specimen HSS-08 was subjected to 36 complete cycles...
Facility: University of Washington, WA, United States


  Experiment-9: HSS-09
Dates: November 17, 2005 - November 17, 2005
Description: Inelastic behavior of the frame included buckling and yielding of the brace, yielding of the gusset plates, beams, and columns, local buckling of the framing elements, and ductile tearing of the welds. Failure of the specimen was brace fracture in the...
Facility: University of Washington, WA, United States


  Experiment-10: BRB Reference Specimen (BRB-05)
Dates: March 18, 2005 - March 18, 2005
Description: The reference specimen had full force displacement curves as would be expected from a buckling restrained brace. Failure occurred during the compression excursion of cycle 36.
Facility: University of Washington, WA, United States


  Experiment-11: BRB-01
Dates: November 23, 2004 - November 23, 2004
Description: Specimen BRB01 was tested using a different actuator than the other specimens. During the compression excursion of cycle 31, the actuators’ tensile capacity (brace compression) was met at a drift ratio of -0.9%, and a force of -260 kip. For the remainder...
Facility: University of Washington, WA, United States
Enter experiment photo caption

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  Experiment-12: BRB-02
Dates: February 05, 2005 - February 15, 2005
Description: The behavior of BRB-02 was nearly identical to that of the BRB reference test and failure resulted from the loss in stability of the SW beam and out of plane plastic hinging of the BRB core. The specimen had full force displacement curves as would be...
Facility: University of Washington, WA, United States


  Experiment-13: BRB-03
Dates: February 11, 2005 - February 11, 2005
Description: Specimen BRB03 had full force displacement curves as would be expected from a buckling restrained brace. The response of specimen BRB03 was nearly identical to that of the reference BRB specimen and BRB02, and failure resulted from the loss of stability...
Facility: University of Washington, WA, United States


  Experiment-14: BRB-04
Dates: March 03, 2005 - March 03, 2005
Description: Specimen BRB04 had full force displacement curves as would be expected from a buckling restrained brace. The differences noted with specimen BRB04 relative to other specimens included yielding and buckling at additional locations. The failure of...
Facility: University of Washington, WA, United States


  Experiment-15: HSS-12
Dates: May 11, 2006 - May 11, 2006
Description: HSS-12 ultimately failed through brace fracture during the tension cycle. The gusset plate welds did not initiate cracking and limited yielding of the framing elements and gusset plates was observed.
Facility: University of Washington, WA, United States


  Experiment-16: HSS-13
Dates: June 27, 2006 - June 27, 2006
Description: Specimen HSS-10 experienced fillet weld cracks that were greater than on quarter of the weld length, therefore this specimen was tested to investigate CJP welds on the system and connection performance. The failure of this specimen was brace fracture...
Facility: University of Washington, WA, United States


  Experiment-17: HSS-14
Dates: August 04, 2006 - August 04, 2006
Description: In order to alleviate the stress concentrations that may be felt at the net section, a 7/8 inch hole was drilled at the end of the slot and was reamed out for added smoothness. The specimen failed as a result of brace fracture at the midspan of the...
Facility: University of Washington, WA, United States


  Experiment-18: HSS-15
Dates: August 29, 2006 - August 29, 2006
Description: By reducing the length of the splice, the size of the gusset plate could be reduced, and this potentially
reduces the stiffness of the ...
Facility: University of Washington, WA, United States


  Experiment-19: HSS-16
Dates: October 12, 2006 - October 12, 2006
Description: The potential benefit to using this connection would be that the brace would not have to be field welded to the gusset plate. The problem of fitting the brace in between the gusset plates would also be avoided. Instead, the brace would be shipped to...
Facility: University of Washington, WA, United States


  Experiment-20: HSS-17
Dates: November 14, 2006 - November 14, 2006
Description: This specimen has the same geometry as the other two specimens with tapered plates (HSS-10 and HSS-13) except the thickness of the gusset plate has changed from 1/2 inch to 3/8 inch. This specimen performed very well and the ultimate failure mode was...
Facility: University of Washington, WA, United States


  Experiment-21: HSS-18
Dates: January 11, 2007 - January 11, 2007
Description: The specimen ultimately failed in the 35th cycle due to brace fracture at the plastic hinge. Maximum and minimum drift ratios of 1.60% and -2.59% ...
Facility: University of Washington, WA, United States


  Experiment-22: HSS-20
Dates: April 20, 2007 - April 20, 2007
Description: This specimen failed due to brace fracture in the 35th cycle. A maximum and minimum drift of 1.69% and -2.28 were achieved for a total range of 3.97%. The maximum and minimum lateral loads resisted by the frame were 321.5 kip and -187.7 kip for total...
Facility: University of Washington, WA, United States


  Experiment-23: HSS-21
Dates: June 15, 2007 - June 15, 2007
Description: The specimen ultimately failed on the 35th cycle by fracturing the plastic hinge of the brace. A total drift range of 4.14% was achieved, 1.60% with the brace in tension and -2.55% in compression. The maximum and minimum lateral load resisted by the...
Facility: University of Washington, WA, United States


  Experiment-24: HSS-22
Dates: August 01, 2007 - August 01, 2007
Description: The specimen failed due to brace fracture at the plastic hinge while going to peak positive displacement of the 35th cycle. The maximum and minimum drift ratios achieved were 1.49% and -2.48% for a total drift range of 3.97%. The frame resisted a maximum...
Facility: University of Washington, WA, United States


  Experiment-25: WF-23
Dates: November 02, 2007 - November 02, 2007
Description: the northwest shear tab connection. The specimen achieved maximum and minimum story drifts of, 2.35% and -3.21%, for a total drift range of 5.56%. The frame maximum and minimum lateral resistance was 338.2 kip and -149.5 kip, for a total range of 487...
Facility: University of Washington, WA, United States
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