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Abstract
This study presents a simple method to improve the bond performance of reinforced concrete (RC) beams with high-strength stirrups. Experiments are carried out under cyclic loads to investigate the bond behavior of RC beams with various steel ratios and yield strengths of the transverse reinforcement. Furthermore, an analytical approach that considers the bond strength of the longitudinal reinforcement is proposed to predict the member capacity. The experimental results show that specimens with the same transverse reinforcement ratio exhibit similar bond behavior, regardless of the yield strength of the transverse reinforcing bars. The results also confirm that confining the longitudinal steel bars using the proposed U-shaped unclosed reinforcement greatly improves the bond performance of RC beams. A comparison of the analytical and experimental results shows that the proposed model predicts the test results better than the existing formulas.