Bond behavior of BFRP bars in concrete under lateral pressure

Abstract Basalt fiber reinforced polymer (BFRP) bars have been widely studied because of its advantages in corrosive environment. At present, the researches on the bond properties of basalt FRP bars mainly focus on the types of bars, bond length and environmental effects. In this paper, the bond properties of 12 mm diameter glass fiber reinforced bars with unilateral and bilateral compressive stresses of 0, 0.15, 0.3, 0.45, 0.6 and 0.75 were studied for revealing the effects of lateral stress. In addition, based on the analysis of the influence of compressive stress on the failure mode, a theoretical analysis model is established. Based on the fitting of ultimate bond strength and slip amount, the bond slip constitutive model of basalt fiber embedded in concrete is proposed, which can work under different compressive stress.