EFFECTS OF BFRP LATERAL CONFINEMENT ON BOND BEHAVIORBETWEEN GFRP RIBBED BARS AND CONCRETE

Abstract

Abstract: A total of 36 pull-out specimens were tested to evaluate the bond behavior between GFRP ribbed bars and BFRP-confined concrete. Test parameters included BFRP layers (0 ply, 1 ply, 2 plies and 3 plies) and the concrete cover to bar diameter ratio c/d (1.6, 2.2 and 3.0). The test results indicated that the typical failure mode of the specimens was changed from brittle splitting failure to ductile pull-out failure due to the lateral confinement of BFRP. The bond strength and the corresponding slip as well as confining stress were increased with the increasing number of BFRP layers. Based on the same BFRP confinement, normalized bond strength was increased with the increase of c/d, while the confining stress corresponding to bond strength was increased exponentially with the deceasing c/d. A logarithmical relationship was observed between the increment of normalized bond strength and the confining stress of BFRP corresponding to the bond strength.

Key words: FRP bar, bond behavior, lateral confinement, concrete cover to bar diameter ratio, bond stress-slip relationship, composite

CLC Number:

TB332

WANG Yan-lei, WANG Mi-feng, ZHANG Xue, XU Qing-feng. EFFECTS OF BFRP LATERAL CONFINEMENT ON BOND BEHAVIORBETWEEN GFRP RIBBED BARS AND CONCRETE[J]. Composites Science and Engineering, 2020, 0(4): 5-12.

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