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Computers and Concrete
  Volume 23, Number 3, March 2019 , pages 171-188

Isogeometric analysis of gradient-enhanced damaged plasticity model for concrete
Jun Xu, Shuai Yuan and Weizhen Chen

    This study proposed a new and efficient 2D damage-plasticity model within the framework of Isogeometric analysis (IGA) for the geometrically nonlinear damage analysis of concrete. Since concrete exhibits complicated material properties, two internal variables are introduced to measure the hardening/softening behavior of concrete in tension and compression, and an implicit gradient-enhanced formulation is adopted to restore the well-posedness of the boundary value problem. The numerical results calculated by the model is compared with the experimental data of three benchmark problems of plain concrete (threepoint and four-point bending single-notched beams and four-point bending double-notched beam) to illustrate the geometrical flexibility, accuracy, and robustness of the proposed approach. In addition, the influence of the characteristic length on the numerical results of each problem is investigated.
Key Words
    damaged plasticity model; concrete; isogeometric analysis; implicit gradient-enhanced formulation; characteristic length
Jun Xu, Shuai Yuan and Weizhen Chen: Department of Bridge Engineering, Tongji University, Shanghai, China

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