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This paper presents a method for predicting premature separation of carbon fiber reinforcedplastic (CFRP) plates from strengthened steel beams. The fracture criterion based on material-inducedsingularity is formulated in terms of a singular intensity factor. Static test on double strap joints wasselected to provide the critical stress intensity factor in the criterion because good degree of accuracy andconsistency of experimental data can be expected compared with the unsymmetrically loaded single lapjoints. The debond/separation loads of stel beams with different CFRP lengths were measured and comparedwith those predicted from the criterion. Good agreement betwen the test results and the prediction was found.