Abstract: The deterioration of bonding performance between reinforcement and concrete is one of main reasons for the decrease of load carrying capacity of RC component.Based on the experimental results of corroded RC beam, the finite element models were built by Solid 65, Link8 and Combin39 element in ANSYS and updated according to the curves of load vs.displacement of the test beams.The suitable correction coefficients for deteriorate bonding strength between reinforcement and concrete were obtained from the former work.Finally, the curve fitting on these correction coefficients vs.corrosion ratio was used to obtain the equation for calculating the bonding strength bonding strength in corroded RC beams.The equation can be used to calculate the load carrying capacity of existing concrete structures and their condition assessment.

Key words: corrosion of reinforcement;RC beam;bonding performance;model update;curve fitting