To the fatigue performance of prestressed CFRP-reinforced steel plates with central defects and double-edge defects.Based on the team's self-developed self-bonding prestressed CFRP application device,fatigue tests of prestressed CFRP single-sided reinforced steel plates with defects under tensile cyclic loading were carried out for two defect types and three defect lengths.In addition,the two-stage prestressing of the specimens was analyzed,and the damage mode,fatigue life and the number of load cycles-plate surface strain distribution law of the specimens under finite bond length were discussed.A finite element model was established using ABAQUS,and the stress distribution of the steel plate,CFRP and adhesive layer under different fatigue crack lengths was analyzed by the calculated results.Furthermore,the degradation law of glue layer stiffness was discussed,the effects of CFRP and pre-stress on the stress intensity factor amplitude △K at the crack tip were explored,and the fatigue life of the defective steel plate was predicted based on the Paris model of crack closure effect.The results show that the self-bonded prestressed CFRP-reinforced steel plate has a longer smooth fracture surface and longer stable fatigue crack expansion area under a finite bond length,which can better increase the critical crack length of the steel plate;the prestressing can improve the reinforcement effect of CFRP,make CFRP bear more load,improve the stress distribution of the steel plate and the adhesive layer,reduce the stress concentration in the defective area,and delay the stiffness of the adhesive layer.The CFRP and prestressing can effectively reduce the stress intensity factor amplitude △K at the crack tip and improve the fatigue life of steel plates;the Paris formula based on the finite element calculation of △K and the crack closure effect can accurately predict the fatigue life of the defective steel plate,and the error between the predicted value and the test value is less than 10％.
bridge engineeringprestressed CFRPfinite element analysisdefective steel platefatigue performancestress intensity factor
万方数据
维普
