Hysteretic Performance of New Generation Buckling Restrained Braces


Abstract eng:
The performance of a new type of Buckling Restrained Braces (BRBs) is described in this research. These BRBs offer advantages since the steel core is composed of straight steel plates with connection plates welded perpendicular to the steel core; this is different from conventional BRB designs in which the steel core plates are continuous with the connection plates. Since the steel core plate is prismatic, construction of the new type of BRBs saves steel material and reduces manufacturing costs. Four full-scale BRBs using a prismatic steel core were tested under quasi-static cyclic load with either a single core plate or dual core plates, and connection plates either bolted or welded to gussets. In the full-scale experiments, the ratio of maximum compression to maximum tension ranged between 1.06 and 1.25 and the cumulative inelastic deformation was 2.1 to 3.1 times higher than American Institute of Steel Construction (AISC) requirements. The hysteresis curves exhibited stable, repeatable behavior with positive incremental stiffness. There was no rupture, instability, or end-connection failure for deformations up to 2% story drift; at failure, the steel core plates achieved strains between 3.2 and 4.2%. The performance of the new BRBs was comparable to conventional BRBs in terms of cumulative hysteretic energy dissipation. Buckling of the steel core plates in either the strong-axis or weak-axis was observed in the experiments. The strong-axis and weak-axis buckling behavior was analyzed using strut-and-tie models. Bulging of the steel casing was observed in some of the experiments. The bulging behavior is idealized as a local buckling phenomenon using plastic analysis models for strong-axis or weak-axis buckling. In this paper, a model is proposed for determining the potential for bulging when strong-axis buckling occurs.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1276.:
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