Abstract
Local bond behavior of glass fiber reinforced polymer (GFRP) bars under cyclic loading is systematically analyzed by beam-end tests. Meanwhile, the corresponding bond tests under monotonic loading were carried out for comparative analysis. In addition, the influence of concrete strength and lateral confinement from the concrete cover and stirrups on the bond behavior was considered in the tests. The results revealed that the specimen under cyclic loading exhibits narrower cracks but more seriously damaged bond interface than that under monotonic loading. It indicates that interface crushing exerts a decisive role in inducing the bond deterioration under cyclic loading, and the bond deterioration of specimens under cyclic loading was more severe. The increase of concrete strength and lateral confinement magnified the effects of cyclic loading on bond deterioration. Furthermore, a bond stress-slip model for GFRP bars under cyclic loading was put forward to better predict the bond behavior of GFRP bars with different confinements.
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