Abstract
Tension stiffening in a reinforced concrete member has been known to result from crack formation and bond-slip between the reinforcing bars and the surrounding concrete. The authors develop an analytical model for the stiffness of reinforced concrete uniaxial members with gradually forming cracks based on the bond-slip mechanism. Crack strain, defined by the derivative of the local slip, is introduced as inelastic strain and contributes to making resonable formulation for the analysis of a cracked concrete field. In the paper, purely theoletical solutions of stress-total strain relations of cracked reinforced concrete are presented for both linear elastic and elastic brittle fracture models of local bond-slip relations. Finally, the authors' model is proposed and compared with experimental results from other researchers.
