Study of buckling-restrained braces with concrete infilled GFRP tubes

A State-of-the-Art Review of FRP-Confined Steel-Reinforced Concrete (FCSRC) Structural Members

“…The investigated parameters varied and included the sectional configuration, the type of the three constituent materials, the slenderness ratio, and the load eccentricity. On the other hand, the concept of FCSRC systems has been applied to the buckling restrained braces (BRBs) that are commonly used as passive energy dissipation devices in seismic zones (i.e., stabilizing steel braces with FRP reinforcements) [58][59][60][61][62][63][64][65][66][67][68]. As shown in Figure 6, in such a form of BRBs, FRP composites are often used as the external shell, which can provide confinement to improve the buckling behavior and ultimate strength of the steel core.…”

“…Recently, FRP composites with high stiffness have been adopted to prevent the local and overall buckling failure of slender steel members [58,[96][97][98]. Many efforts have been made to apply the concept of FCSRC systems in BRBs for structural repairing [58][59][60][61][62][63][64][65][66][67][68].As shown in Table 2, previous studies on FCSRC BRBs have focused on behavior under axial compression or reversed cyclic loading. The studied parameters included variables of the…”

“…Several studies have focused on the cyclic performance of BRBs. Sun et al [63] investigated the hysteretic behavior of the pre-fabricated BRBs by testing seven BRB specimens with concrete-filled GFRP tubes and three BRB specimens with concrete-filled steel tubes. They found that global buckling only occurred in the medium-and long-length BRBs confined with filament-wound GFRP tubes (fibers in the hoop direction with a winding angle of 56 • ), while BRBs confined with pultruded GFRP tubes (fibers in both hoop and longitudinal directions) exhibited more stable hysteretic responses in which the maximum compressive loads could exceed about 1.4 f y A and no global buckling occurred.…”

“…They found that global buckling only occurred in the medium-and long-length BRBs confined with filament-wound GFRP tubes (fibers in the hoop direction with a winding angle of 56 • ), while BRBs confined with pultruded GFRP tubes (fibers in both hoop and longitudinal directions) exhibited more stable hysteretic responses in which the maximum compressive loads could exceed about 1.4 f y A and no global buckling occurred. Thus, Sun et al [63] suggested the use of filament-wound GFRP tubes for shorter BRB and pultruded GFRP tubes for longer BRBs.…”

“…Up to date, FCSRC systems have been adopted to strengthen/repair steel structures [32][33][34][35][36]52,55] and as new hybrid structural members (e.g., hybrid columns, beams [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]53,54,56,57], or buckling restrained braces (BRBs) [58][59][60][61][62][63][64][65][66][67][68]). Extensive studies have been carried out to understand the performance of such forms of hybrid structural members, and they have been shown to have excellent performance.…”