Development of a novel high-performance all-steel fish-bone shaped buckling-restrained brace. (1st May 2017)

• Record Type: Journal Article
• Authors: Jia, Liang-Jiu; Ge, Hanbin; Maruyama, Rikuya; Shinohara, Kazuki
• Is Part Of: Engineering structures. Volume 138(2017:May 01)
• Page Start: 105
• Page End: 119
• Publication Date: 2017-05-01
• Subjects: Bucking-restrained brace -- All-steel -- Fish-bone -- Seismic -- Cyclic; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2017.02.006
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A novel light-weight all-steel fish-bone shaped buckling-restrained brace developed. The BRB can effectively utilize post-necking deformation capacity by formation of multiple necks. Cyclic tests using four scaled specimens carried out to study seismic performance. Excellent maximum and cumulative ductility capacities obtained in the experiments. Failure mechanism of the newly proposed BRB evaluated through advanced fracture simulation. Abstract: Based on investigation of recent strong earthquakes, there is a potential that BRBs may rupture during a strong earthquake or subsequent repeated aftershocks. This study aims to propose a novel type of light-weighted all-steel dismountable BRB with fish-bone shaped core plate, which is termed FB-BRB in this paper. The FB-BRB consists of a core plate, two filling plates, two restraining plates and unbonding material. Deformation capacity of the proposed FB-BRB is to be maximized by generating several necking locations at the core plate, and details to avoid strain concentration at stoppers are also proposed. Experimental study is carried out using four scaled specimens with different configurations. Favorable seismic performance is obtained through comparison with that of a conventional BRB. The failure mechanisms of the newly proposed FB-BRBs are also further verified through numerical study using a combination of a ductile fracture model and a cyclic plasticity model, where further improvement is required to fully achieve the expected deformation mechanism.