Experimental Study on Miniature Buckling-restrained Brace with Corrugated Core Bar. Issue 13 (3rd October 2022)

• Record Type: Journal Article
• Authors: Gu, Tianyu; Li, Jiong-Hui; Sun, Jubo; Jia, Liang-Jiu; Liu, Tao; Ge, Hanbin
• Is Part Of: Journal of earthquake engineering. Volume 26:Issue 13(2022)
• Page Start: 6633
• Page End: 6655
• Publication Date: 2022-10-03
• Subjects: Buckling-restrained brace -- corrugated core bar -- cyclic loading -- theoretical analysis -- seismic design; Earthquake engineering -- Periodicals; 624.1762
• DOI: 10.1080/13632469.2021.1927907
• Languages: English
• ISSNs: 1363-2469

Abstract

ABSTRACT: Miniature buckling-restrained braces (MBRBs) have been widely used as energy dissipating dampers in precast concrete and steel beam-to-column connections for their superior seismic performance. This paper proposes a new type of all-steel MBRBs with corrugated core bars, termed as corrugated MBRBs (CMBRBs), of which the core bars are confined by circular hollow section restraining tubes. Several D-shaped cuttings, termed as D-cuts, are made on core bar to improve ductility, so that the CMBRB can have a shorter length compared with conventional MBRBs, which leads to smaller installation space of the beam-to-column connections. Six specimens were designed and tested under cyclic loading to investigate effects of slenderness ratio and segment spacing-to-D-cut cross-section height ratio on seismic performance, and it was found that the two parameters have great effects on strength, stiffness, energy dissipation capacity and ductility. A theoretical model was established to predict stiffness and strength of the proposed CMBRB. Finally, a design procedure and recommended values for the parameters were proposed.