Computers and Concrete

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Validation of a non-linear hinge model for tensile behavior of UHPFRC using a Finite Element Model

  • Mezquida-Alcaraz, Eduardo J. (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Navarro-Gregori, Juan (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Lopez, Juan Angel (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Serna-Ros, Pedro (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia)
  • Received : 2018.08.15
  • Accepted : 2019.01.15
  • Published : 2019.01.25
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Abstract

Nowadays, the characterization of Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) tensile behavior still remains a challenge for researchers. For this purpose, a simplified closed-form non-linear hinge model based on the Third Point Bending Test (ThirdPBT) was developed by the authors. This model has been used as the basis of a simplified inverse analysis methodology to derive the tensile material properties from load-deflection response obtained from ThirdPBT experimental tests. In this paper, a non-linear finite element model (FEM) is presented with the objective of validate the closed-form non-linear hinge model. The state determination of the closed-form model is straightforward, which facilitates further inverse analysis methodologies to derive the tensile properties of UHPFRC. The accuracy of the closed-form non-linear hinge model is validated by a robust non-linear FEM analysis and a set of 15 Third-Point Bending tests with variable depths and a constant slenderness ratio of 4.5. The numerical validation shows excellent results in terms of load-deflection response, bending curvatures and average longitudinal strains when resorting to the discrete crack approach.

Keywords

Acknowledgement

Supported by : State Research Agency of Spain

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