Experimental research of assembled buckling-restrained braces wrapped with carbon or basalt fiber. (April 2017)

• Record Type: Journal Article
• Authors: Jia, Mingming; Yu, Xiaohui; Lu, Dagang; Lu, Binbin
• Is Part Of: Journal of constructional steel research. Volume 131(2017)
• Page Start: 144
• Page End: 161
• Publication Date: 2017-04
• Subjects: Assembled buckling restrained brace (ABRB) -- Carbon fiber -- Basalt fiber -- Hysteretic behavior -- Multi-wave buckling; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2017.01.004
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: A new assembled buckling-restrained brace (ABRB) wrapped with carbon or basalt fiber cloth is proposed. It has the following advantages: 1) it can be disassembled by cutting the fiber cloth; 2) it is easy to inspect and repair the core plates after destructive earthquakes; 3) the outer fiber material also serves as a corrosion resistance to the outer steel tube. A total of eight ABRB specimens were tested under quasi-static axial loads. The test results indicate that the ABRB is capable to undergo fully-reverse yielding cycles without loss of stiffness and strength with sufficient ductility and energy absorption capacity. Multi-wave buckling occurred on the core plates of ABRBs resulting in "jumped" hysteretic curves in compression stage. ABRB specimens fractured in the middle of the core plate elements when a loading protocol included increasing deformation amplitudes with additional fatigue cyclic loading; while when the loading protocol consisted of increasing deformation amplitude cyclic loading without maximum amplitude limit, rupture of the ABRB specimens occurred at the junctions of yielding segments and non-yielding segments of core plate. When a pair of restraining members of an ABRB are connected and restrained with fiber cloth, the assembled constraint mechanics can resist the lateral thrust exerted by core plate. The nonlinear finite element analysis results show good agreement with the experimental data. Both the results from the experiment and numerical simulation show that the proposed ABRBs can satisfy the performance requirements for the BRB components and provide a beneficial alternative for BRB fabrication and application. Highlights: A new assembled buckling-restrained brace (ABRB) wrapped with carbon or basalt fiber cloth is proposed. New ABRB is easy to disassemble and the outer fiber material serves as a corrosion resistance to the outer steel tube. Performance of the new ABRB has been examined by experiments and nonlinear finite element analysis. The new ABRB shows good hysteretic behavior and high energy dissipation capacity. The assembled constraint mechanics of fiber cloth can resist the lateral thrust exerted by core plate after its buckling.