Browsing by Autor "Ricardo Perera"

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    EXPERIMENTAL STUDY ON CRACKING AND DEFLECTION BEHAVIOUR OF RC BEAMS STRENGTHENED WITH EBR CFRP LAMINATES UNDER DIFFERENT PRELOADING CONDITIONS
    (European Organization for Nuclear Research, 2023) Luis Felipe Jiménez; A. Codina; Younes Jahani; Ricardo Perera; Cristina Barris
    This study experimentally evaluates the influence of a pre-cracked stage on the deflection and cracking behaviour of reinforced concrete (RC) beams strengthened with externally bonded CFRP laminates. Three RC beams were loaded until their service load, then strengthened and tested until rupture, while three other identical beams, were strengthened and directly tested until failure. The midspan deflection and a total of 145 cracks were studied through the Digital Image Correlation. The experimental results were compared with sectional analysis theoretical predictions, while crack spacing and width were compared to Ceroni and Pecce proposal. Main findings indicate that the pre-cracked stage does not have a clear influence on the final deformational behaviour of the beam.
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    Simplified Model of Low Cycle Fatigue for RC Frames
    (American Society of Civil Engineers, 1999) Alberto Carnicero López; Ricardo Perera; Enrique Alarcón; Edward Thomson; América Bendito; Júlio Flórez-López
    This note describes a simplified model of damage for reinforced concrete (RC) frame members. The model is different from those proposed in the literature because it combines the concept of inelastic hinge and the methods of fracture and continuum damage mechanics. The model allows the characterization of the following effects: (1) unsymmetrical cross section with different yield capabilities at positive and negative bending; (2) influence of the axial force on the flexural member behavior, stiffness, and strength degradation due to cracking of the concrete; (3) plastic deformations due to the yield of the reinforcement; and (4) different stiffness under positive and negative flexure due to unsymmetrical cracking even in symmetrical sections and low cycle fatigue. The modeling of the low cycle fatigue effects, which is the main object of this note, is made using concepts from fracture mechanics. Numerical simulations of tests reported in the literature validate the model.