RESEARCH ON FINE MODELING THEORY AND METHOD IN STEEL REINFORCED CONCRETE STRUCTURES BASED ON BOND-SLIP

Based on the bond slip mechanism of a steel-reinforced-concrete (SRC) structure, the axial deformation for steel fibers in the integral segment of SRC beam-column elements is divided into an axial deformation of steel and a bond slip. This method can describe the inconsistent deformation between steel and concrete to reflect the bond slip effect according to the plane-section assumption. Through the bond-slip constitutive model embedded to an existing steel constitutive model, a new steel constitutive model with bond-slip effect is established and the way for determining the status of steel fibers is proposed. Then the numerical analysis of an SRC frame column is conducted with a new material model implanted into OpenSEES program. Eventually, by comparing the numerical result with the experimental data, the reasonableness and accuracy of the new material model can be verified.