Experimental Study And Numerical Simulation On Shear Capacity Of RC Beams Strengthened With Prestressed Steel Sheets

Due to the improvement of design level and operation conditions change and otherreasons, the existing reinforced concrete beam’s shear bearing capacity also degradatedand need to be strengthened. As a new type of strengthening technology, prestressedsteel sheets strengthening can effectively and conveniently improve the shear behavior ofRC beams with low cost, and it shows wide application prospect.Based on the tests of one simply supported ordinary RC beam and six specimensstrengthened by prestressed steel sheets, studies about specimens failure pattern andshear bearing capacity were carried out under different steel sheet space, steel sheetlayer and chamfering processing. Besides these, the steel sheet’s strain was alsoanalysed. Test results show that the strengthening technology using prestressed steelsheets can remarkably enhance the common oblique section RC beam’s bearingcapacity and deformation capacity. In these factors, the reinforcement spacing is themost significant effect of all.Specimens were simulated by the ANSYS software and the analysis results wereagreed well with the experimental data. And then, six RC beams strengthened underspecified steel sheet space were simulated for different shear span ratio and value ofprestressing. The study was concentrated on the specimen’s shear bearing capacity andprestressed steel sheets related behavior, which largely enriched the researching findingsfor this new strengthening technology.According to the testing process and steel sheets strain data, the shear resistantmechanism of strengthened specimens was studied and the truss model was defined to analysis the bearing capacity. On the basis of tests results and numerical simulation, thecalculation formula of ultimate bearing capacity was deduced. Combining the code fordesign of concrete structures, shear bearing capacity calculation formula of thisstrengthening technology was proposed. The calculated results were well matched withthe tests data, which indicating that the formula can be computed feasible forstrengthened specimen’s shear capacity. And the formula can provide theory referencefor the follow-up research and practical engineering application.