Abstract
An analysis of finite elements whose sectional area was measured was conducted for corroded reinforcements extracted from three actual concrete structures. The variable factor for the analysis was the length of the finite elements. The analysis result shows that the length of finite elements remarkably influences the deformation capacity after yielding. The results of the analysis of the stress-strain curve using finite element length twice the reinforcement diameter show good agreement with experimental results. For the purpose of convenience for the finite element analysis of whole concrete structures, the analytical stress-strain curves were modeled using a bi-linear model. The results show that tensile strength and yield strength decrease proportionally with the reduction of the minimum sectional area of corroded reinforcement. The decrease in yield strain was more gradual than that of tensile and yield strength. The second stiffness of the bi-linear model increased as the minimum sectional area decreased. The ultimate strain at tensile strength declined remarkably as the minimum sectional area decreased.
