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Carga-deformación en la sección de hormigón a la altura de la armadura longitudinal en el centro de la luz para las vigas ensayadas a flexión.
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This paper presents an experimental study on the flexural and shear behavior of reinforced concrete beams with a fines content (275 kg/m3) higher than the limit value allowed by the Spanish Concrete Code EHE-08 (175 kg/m3). In the studied range, the fines content scarcely affected the flexural response. The shear strength of the beams with a high c...
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A series of model tests were conducted to investigate the bearing capacity and reinforced mechanism of a horizontal–vertical (H–V) geogrid-reinforced foundation. The bearing capacities of the unreinforced foundation, the conventional geogrid, and the H–V geogrid-reinforced foundation were compared. The parameters, including the length of the H–V ge...
The single plate shear connection often called a shear tab, is primarily used to transfer the shear reaction of a beam. In a simply supported beam, in addition to considerable shear force, the connection is subjected to rotations due to the end rotation of the beam. Recently, a research project was conducted at the University of California at Berke...
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Citations
... Under incremental loading, a second branch of the crack develops inside the un-cracked longitudinally compressed concrete chord, which will connect the first branch of the crack and the load application point, producing failure. One of the main assumption of the MASM, supported by empirical observations of various authors [45,46], is that when the second branch of the critical crack develops, the load does not significantly increase, as softening of the concrete in the compression zone initiates, see Fig. 1b. ...
A punching shear strength mechanical model for RC flat slabs with and without shear reinforcement, based on a beam shear model previously developed by the authors, is presented. The differences in resisting actions between beam shear and punching shear have been identified and incorporated into the governing equations and failure modes, resulting in simple but accurate punching design equations. The model consistently explains and quantifies some experimentally observed phenomena, such as the higher contribution of the concrete to the punching shear strength of slabs than in the case of beams subjected to shear, mainly due to the multi-axial state of stresses that takes place near the support. Furthermore, the model provides physical meaning to some parameters used in the design, such as the position of the critical perimeter or the effective stress of the punching reinforcement, among others. Very good agreement has been obtained between the model predictions and the results of 560 punching tests of concentrically loaded slabs, with and without shear reinforcement, included in two available large databases. The mechanical character of the model allows its extension to post-tensioned flat slabs, border or corner columns, steel fiber and FRP reinforced concrete slabs or different strengthening systems in a consistent way.
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The chloride diffusion coefficient indicates the capacity of a particular type of concrete to resist chloride penetration and is therefore used to predict the service life of a particular reinforced concrete structure exposed to environments containing this type of aggressive agent. Its experimental determination is time-dependent and time-consuming. For that reason, our study analyzes the characteristic behavior of the diffusion coefficient (D) of concretes in the saturated condition by testing higher NaCl concentrations and lower contamination ages than those used in standardized tests, in addition, the objective is to analyze the behavior of surface chloride concentration (Cs) over time. Therefore, it was concluded that for concrete dosed with pozzolanic cement, the Cs value varied with increasing tendency at higher ages. In addition, the D value obtained by the proposed method presented values close to those obtained by standardized tests at contamination ages of 21 and 35 days.
A mechanical model is presented for shear-flexural strength of slender reinforced concrete beams under concentrated or distributed loads. The model incorporates the shear transferred by the un-cracked concrete head, by the cracked web and by the longitudinal and transverse reinforcements. Failure is assumed to occur at the un-cracked concrete zone, subjected to a biaxial stress state, when the Kupfer failure envelope is reached and the stirrups are yielded. A general procedure and simplified direct design equations are derived taking into account equilibrium and a given stress distribution at ultimate limit states (ULS). The model predictions have been compared with the results of more than 1300 tests performed on simply supported beams, having obtained very good agreement. Because of the simplicity, accuracy, and the physical insight of the problem provided by the model, it may be very useful for rational performance-based design of concrete structures in practice.
