Abstract: In order to study the long-term deformation performance of RC beams strengthened with CFRP plates in practical engineering and to provide a basis for the judgment of whether the strengthened beam meets the normal service limit state of the structure during the long-term use, and to solve the problems that the long-term test operation is difficult and the time span is too long, the long-term deformation test of reinforced concrete beams strengthened with CFRP sheets is carried out under continuous load. A nonlinear finite element model for calculating long-term deformation of reinforced concrete beams strengthened with CFRP sheets is established. The results of numerical calculation are in good agreement with the experimental results. The long-term deformation of reinforced beams with different thickness of CFRP plates is numerically calculated by using this model. The results show that CFRP plate has little effect on the long-term deformation of reinforced beams, and the total deformation decreases mainly from the restriction of CFRP plates to the instantaneous deformation.

Key words: CFRP plates, long-term deformation, experimental research, numerical simulation