Reduction of thermal stress induced in steel plate strengthened by bonding CFRP plate on one side

In steel members strengthening with CFRP plate, thermal stress is introduced in steel members by temperature change, due to the mismatch of coefficients of linear thermal expansion of steel and CFRP. In the previous study, a reduction technique of thermal stress in steel members, which is additional bonding of aluminum alloy plates with CFRP plates, was proposed. However, by bonding laminated plate consisting of CFRP and aluminum plates on one side of thin steel plate, thermal stress is not completely reduced. Therefore, to confirm the effectiveness of proposed method for one side bonding, heat tests of steel plate with bonding laminated plate on one side were carried out. Additionally, to verify the test results, numerical analysis for proposed method was also carried out. As a result, it was found that the three-layered laminated plate consisting of one CFRP plate and two aluminum plates was required for reduction of thermal stress in thin steel plate.