TY - JOUR T1 - Use of iterative algorithms to calculate the softening curve in concrete JO - Boletín de la Sociedad Española de Cerámica y Vidrio T2 - AU - Gómez,F.J. AU - Martín-Rengel,Miguel Angel AU - Ruiz-Hervías,Jesus AU - Fathy,A.M. SN - 03663175 M3 - 10.1016/j.bsecv.2018.06.003 DO - 10.1016/j.bsecv.2018.06.003 UR - AB - This paper presents an original procedure to determine the softening curve in concrete from a diametric Brazilian test and a three point bend test. An inverse procedure is proposed combining experimental results, numerical finite element computation and an iterative algorithm, called algorithm AMS-UPM, developed expressly for this research. The starting point of the algorithm is a bilinear softening curve, on which a successive transformations are applied decreasing the difference between the experimental and numerical results in each step. The procedure has been applied successfully to two conventional concretes. The final result is a softening curve that adjusts almost perfectly experimental data of the three point bending test. ER