Experimental research of assembled buckling-restrained braces wrapped with carbon or basalt fiber

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.

Research on the seismic retrofitting performance of RC frames using SC‐PBSPC BRBF substructures

“…C, Axial force-displacement relationship FIGURE 7 Test 3 to verify the modeling strategy of assembled buckling-restrained braces (ABRBs). 27 A, Test 3: assembled buckling-restrained-braces. B, Load-displacement relationship tendon using the truss element and Steel02 material.…”

“…To prevent global flexural buckling, the corresponding buckling capacity shall be higher than the ultimate capacity. 27 If any of the dimensions are exceeded or if the calculated steel plates are obviously smaller, the design procedure may return to…”

“…The stopper effects on the hysteresis/fatigue performance were evaluated experimentally and numerically. Dusicka et al and Jia et al reformed the constraining parts of an ABRB with FRP pultruded tubes or by wrapping the brace with fiber cloth, further improving the buckling‐restraining effect. Although relevant studies of the braces have proven the ideal energy‐consumption abilities of these components, applications of these braces in structure upgrading will cause large residual deformations, requiring subsequent repairs with massive costs.…”

Analysis of the Seismic Demand of High‐Performance Buckling‐Restrained Braces under a Strong Earthquake and Its Aftershocks

“…Researchers proposed a series of novel HPBRBs, which was based on the construction of the specimens and the material specimens. Jia et al [12] proposed an assembled bucklingrestrained brace wrapped with carbon or basalt fiber, which could improve the restraining members and sufficient ductility and energy dissipation capacity. Jia et al [13] proposed a type of fish-bone BRB (FB-BRB), which could avoid strain concentration along the length of the core member and improve the energy dissipation capacity during a strong earthquake or subsequent repeated aftershocks.…”

Seismic Performance Evaluation of a Proposed Buckling-Restrained Brace for RC-MRFS

“…A concrete-filled steel core is the most commonly used method in BRB and is easy to fabricate at a lower cost [10]. The BRB is wrapped with fibre and experimentally investigated, with the failure of the BRB seen as local buckling in the concrete-filled steel core [11]. This paper presents and investigates a novel BRB design with a debonded gap filled with an EPS sheet at various heights of the outer steel tube.…”