Prediction Model for the Debonding Failure of Cracked RC Beams with Externally Bonded FRP Sheets

摘要

Analytical models based on the compatibility of deformations and equilibrium of forces are presented to predict the failure modes and ultimate strength of reinforced concrete beams strengthened by flexible FRP sheets patched to the tension face of the beams. Using these analytical models, the strain distribution, internal forces across each section and the ductility of the strengthened concrete beams at different load levels (before and after the yielding of the steel reinforcements) can be evaluated. The onset and propagation direction of debonding process of FRP patch can be effectively analyzed by the presented models and match experimental results very well.