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Information Journal Paper

Title

EXPERIMENTAL TESTS ON EXISTING RC BEAMS STRENGTHENED IN FLEXUREAND RETROFITTED FOR SHEAR BY C‑ FRP IN PRESENCE OF NEGATIVE MOMENTS

Pages

  211-232

Abstract

 The shear strength of reinforced concrete beams extracted from existing buildings often reveals insufficient transversal steelreinforcement, mainly due to design or construction defects or increased design load requirements. FRP wrapping is oneof the best solutions to improve beam shear strength as the retrofitting intervention is fast and the cost is modest. Designcodes provide clear indication about the retrofitting design of simply supported beams, while the case of a beam with negativemoments at the end is not considered, although this is in the case of a beam in a framed structure. One of the mainuncertainties lies in the effectiveness of the FRP U sheet anchorage behavior in the area of negative bending moments withcracked concrete. This may limit the shear strength of the retrofitted beam. In this study, two beams extracted from an existingbuilding constructed in the 1930s in Rome and retrofitted by carbon fiber-reinforced polymer (C-FRP) U strips placedat beam ends, where also negative bending moments were present, and have been evaluated with experimental tests at thelaboratory of the Department of Architecture of Roma Tre University. Beam steel and concrete characteristics were evaluatedby means of different tests. The experimental results are discussed considering the final results in terms of maximum shearresistance in the presence of negative bending moments. Load deflections at different points along the beam, shear-C-FRPdeformation along the reinforcement strips and the damage state for different load levels, are presented. The importance ofavoiding possible fragile mechanisms in the sections retrofitted with FRP is clearly shown.

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    APA: Copy

    LAVORATO, DAVIDE, BERGAMI, ALESSANDRO VITTORIO, FIORENTINO, GABRIELE, FIORE, ALESSANDRA, SANTINI, SILVIA, & NUTI, CAMILLO. (2018). EXPERIMENTAL TESTS ON EXISTING RC BEAMS STRENGTHENED IN FLEXUREAND RETROFITTED FOR SHEAR BY C‑ FRP IN PRESENCE OF NEGATIVE MOMENTS. INTERNATIONAL JOURNAL OF ADVANCED STRUCTURAL ENGINEERING, 10(3), 211-232. SID. https://sid.ir/paper/319901/en

    Vancouver: Copy

    LAVORATO DAVIDE, BERGAMI ALESSANDRO VITTORIO, FIORENTINO GABRIELE, FIORE ALESSANDRA, SANTINI SILVIA, NUTI CAMILLO. EXPERIMENTAL TESTS ON EXISTING RC BEAMS STRENGTHENED IN FLEXUREAND RETROFITTED FOR SHEAR BY C‑ FRP IN PRESENCE OF NEGATIVE MOMENTS. INTERNATIONAL JOURNAL OF ADVANCED STRUCTURAL ENGINEERING[Internet]. 2018;10(3):211-232. Available from: https://sid.ir/paper/319901/en

    IEEE: Copy

    DAVIDE LAVORATO, ALESSANDRO VITTORIO BERGAMI, GABRIELE FIORENTINO, ALESSANDRA FIORE, SILVIA SANTINI, and CAMILLO NUTI, “EXPERIMENTAL TESTS ON EXISTING RC BEAMS STRENGTHENED IN FLEXUREAND RETROFITTED FOR SHEAR BY C‑ FRP IN PRESENCE OF NEGATIVE MOMENTS,” INTERNATIONAL JOURNAL OF ADVANCED STRUCTURAL ENGINEERING, vol. 10, no. 3, pp. 211–232, 2018, [Online]. Available: https://sid.ir/paper/319901/en

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