Unified models for bond strength and bond-slip response of deformed rebars in cracked concrete

Cracks in reinforced concrete structures pose a potential risk to their long-term stability and safety, necessitating an accurate analysis of the bond failure mechanism between the reinforcement and the cracked concrete. However, currently, there is a lack of comprehensive bond prediction models for the entire cracking stage, and limited understanding of the bond slip response. To address the aforementioned issues, an improved model incorporating internal pressure, crack width, and failure modes, aiming to provide a more precise estimation of the bond strength between deformed bars embedded in concrete under various cracked cases. The proposed model demonstrates superior performance in predicting cracked cases and failure modes. The performance of the proposed model in predicting cracked cases and failure modes is superior to existing models, as demonstrated by a comparative analysis. Additionally, a comprehensive model is proposed to analyze the bond-slip behavior in cracked concrete. This model introduces a bond reduction factor for cracks, aiming to determine the critical bond length required for bond strength.