Based on the technology analyses of strengthening reinforced concrete beams with carbon fiber sheet, and the research of calculate theory, The paper raises the technology of Relief method.

An elasto-plastic large deformation dynamic semi-explicit algorithm based on the iteration of velocity is proposed, and the U-bending and S-rail spring-back are simulated with die-unloading manner by adopting quasi-bending membrane element.

It cannot be used to determine the damage characteristics of elastoplastic materials by replacing the elastic modulus after damaged with the relaxed modulus.

Fuzzy-stochastic damage increment functional was formulated on the basis of fuzzy attenuation algorithm model by the help of concentrating-damage vector,with which realized was the general expression on unloading model of viscous-elasto-plasto fuzzy-stochastic damage increment functional.