Parameter calibration of a fibre-reinforced concrete fracture model by means of co-simulation between OOFEM and Scipy

In this study, the trilinear softening diagram is adapted and implemented in a smeared crack model of the free finite element code OOFEM and the calibration process of the parameters that define the trilinear softening diagram is carried out by means of an algorithm that makes use of an optimization package of Scipy. To illustrate the performance of this algorithm, an experimental reference of a three-point bending test is used and, by providing the experimental load-displacement diagram and an initial set of parameter values, the algorithm is able to provide a set that minimizes the deviation of the numerical model with respect to the experimental curve. Error is computed as the difference between the experimental and the numerical results at selected points of the load-displacement diagram.