International Journal of Steel Structures

, Volume 18, Issue 2, pp 650–673 | Cite as

Experimental Investigation of Aluminum Alloy and Steel Core Buckling Restrained Braces (BRBs)

  • Cigdem Avci-Karatas
  • Oguz C. Celik
  • Cem Yalcin


Buckling restrained braces (BRBs) display balanced hysteretic behavior under reversed cyclic tension and compression forces and dissipate a significant amount of seismic energy during credible earthquakes. This paper reports on an experimental investigation of newly developed BRBs with different core materials (steel and aluminum alloy) and end connection details. A total of four full-scale BRBs with two steel cores and outer tubes (BRB-SC4 and BRB-SC5) as well as two with aluminum alloy cores and aluminum outer tubes (BRB-AC1 and BRB-AC3) with specific end details were designed as per the AISC Seismic Provisions, manufactured and cyclically tested. These tests made it possible to compare the impact of the steel and aluminum alloy material characteristics on the hysteretic behavior and energy dissipation capacities. The proposed steel and aluminum alloy core BRBs with various end details achieved the desired behavior, while no global buckling occurred under large inelastic displacement cycles.


Steel, aluminum alloy Buckling restrained brace (BRB) Hysteretic behavior Experimental study 



This research was supported in part by the Scientific and Technological Research Council of Turkey (TUBITAK) for project number 110M776 and the Istanbul Technical University Research Projects Unit (ITU-BAP) for project number 33459. The steel core BRBs, gusset plates, and bolts used were donated by CIMTAS. The aluminum alloy outer tubes were provided by FENIS. The polytetrafluoroethylene bands of FIBERFLON were used as the unbonding surface. High strength mortar was donated by KOSTER. Technical assistance from the staff at Istanbul Technical University (ITU), the Structural & Earthquake Engineering Laboratory (STEEL) and Bogazici University’s (BU) Civil Engineering Department and Structures Laboratory are gratefully acknowledged and appreciated. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the supporters and suppliers.


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Copyright information

© Korean Society of Steel Construction 2018

Authors and Affiliations

  • Cigdem Avci-Karatas
    • 1
  • Oguz C. Celik
    • 2
  • Cem Yalcin
    • 3
  1. 1.Department of Transportation Engineering, Faculty of EngineeringYalova UniversityYalovaTurkey
  2. 2.Structural and Earthquake Engineering Division, Faculty of ArchitectureIstanbul Technical UniversityIstanbulTurkey
  3. 3.Department of Civil EngineeringBogazici UniversityBebek, IstanbulTurkey

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