Bonding Behavior Between GFRP Bars and Concrete Under Cyclic Loading Condition

doi:10.19491/j.issn.1001-9278.2018.07.015

Abstract

Abstract: A series of drawing tests were carried out for the standard bonding specimens of GFRP bars with a diameter of 16 mm when embedded in depths of 4d, 5d and 8d under the monotonic loading and cyclic loading conditions, and the variations of the bondingslipping relation, the relationship between embedded depth and bonding strength, and the evolution law of bonding stiffness and slip of loading end with the cycle number. As a result, the evolution law of hysteresis curve under cyclic loading was obtained. The results indicated that fewer cycle times almost had no effect on bonding strength and the amount of slip. The bonding strength did not degenerate significantly but tended to increase to some extent when the test specimen was subjected to cyclic loading with a low stress level and less cycle time. The degradation of bonding strength between GFRP bars and concrete was significant when the test specimen was subjected to cyclic loading under a high stress level. This research result can provide an evidence for further study on fatigue properties of the concrete structures reinforced with GFRP bars.

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