Study on the bond behavior of CFRP sheets to steel

There are several advantages in bonding carbon fiber sheets adhesively on deteriorated steel members than the traditional repair methods, such as, no stress concentrations, no residual stress, easy to construct and low maintenance cost. The bond behavior between carbon fiber sheets and steel affects the effectiveness of strengthening, but research on this subject is still lacking in China. Tensile tests of steel plates repaired with carbon fiber sheets were conducted. Different carbon fiber sheets and anchorage methods were adopted. The yielding loads and ultimate loads of the repaired specimens were measured. Failure modes of the specimens were analyzed. Tests results indicated that the yielding load of the repaired specimens increased obviously. The tensile strains of the carbon fiber sheets were measured. The bond stress distribution between the carbon fiber sheets and the steel plates and the effective bond length of the carbon fiber sheets were obtained. The calculation results were in good agreement with the experimental data.