EXPERIMENTAL RESEARCH ON THE BOND BEHAVIOR OF CFRP TO STEEL

There are several advantages of adhesively bonded carbon fiber reinforced polymer(CFRP) laminates to strengthen deteriorated steel members over traditional retrofit methods.The bond behavior of CFRP to steel affects their load transfer and the effectiveness of strengthening,but there was no research on this subject in China.The suitable adhesives for steel structures strengthening with CFRP were selected from many adhesives.Appropriate specimens were fabricated to test the bond strength and bond durability between CFRP and steel.Test results showed that the properties of adhesives Araldite 2015,Sikadur 330 and Tyfo MB were excellent and they were suitable for steel strengthening with CFRP.Tensile tests of steel plates repaired with CFRP sheets were conducted and the tensile strains of CFRP sheets were measured.The bond stress distribution between CFRP sheets and steel plates and effective bond length of CFRP sheets were obtained.The computed results using the formulas are in good agreements with the experiment data.