Analytical Models of Local ConcreteSteel Bond at Low Temperature

Analytical models of local bond stressslip relationships are established based on an experimental program of 65 specimens in the temperature range between -70°Cand -10°Cand at normal temperature (+20°C).One can conclude that low temperature has little influence on the relationship between concrete compressive strength, fc′,and the maximum bond stress, tmaxas well as bond behavior, except that an increase in compressive strength is associated with an increase in bond strength. An analytical model for cyclic loading is established by estimating the deterioration of bond resistance and reloading stiffness. The deterioration appears to be closely related to the effective energy dissipated during the loading cycles. This analytical model has been applied to describe the bond stressslip relationship of the concretesteel interface under monotonic, repeatedcyclic, and reversedcyclic loading conditions. Very good correlations between the numerical predictions and the experimental results were obtained.