Mechanics‐based model for cold joints in reinforced concrete members

Abstract This study introduces a mechanics‐based numerical model to characterize the behavior of cold joints in reinforced concrete members subjected to monotonic loading. The model incorporates mechanisms such as interface slip and opening, aggregate interlock, clamping force, and dowel action of the reinforcing bars crossing the interface. Its formulation is grounded in equilibrium principles, shear‐slip‐based constitutive relationships, and interface displacement compatibility, with specific consideration of the unique characteristics of cold joints. Validation against a comprehensive experimental database, including slant shear and push‐off tests, demonstrated the model's accuracy in predicting interface shear strength and overall cold joint behavior. The model also effectively captured the influence of critical parameters, marking a substantial advancement in linking cold joint design characteristics to their mechanical response.