8. Summary of results#

The objective of the models presented in this document is to identify the parameters of the ENDO_ORTH_BETON law. Since there is no empirical formula for the values of the parameters to be used, the user must calibrate his parameters step by step on the various tests proposed. The method for calibrating the parameters, found in document [R7.01.09], can be summarised as follows:

  1. choice of \(\mathrm{ALPHA}\): (0.85 to 0.9),

  2. calibration of \(\mathrm{K0}\), \(\mathrm{ECROB}\) on A, C or E models (calculation \(\mathrm{U1}\)). Once these parameters have been calibrated, they should not be modified during the calibration phase of the other parameters,

  3. calibration of \(\mathrm{K1}\), \(\mathrm{K2}\) and \(\mathrm{ECROD}\) on models B (or D) and E. In fact, modeling E (calculations \(\mathrm{U2}\) and \(\mathrm{U3}\)) is sufficient. It makes it possible to verify the value of the breaking stress in simple compression, and to ensure that the rupture envelope for biaxial tests does not swell. It is not necessary to calibrate parameter \(\mathit{K2}\) very finely because it derives from a qualitative argument, and no experimental data is ever available to identify it.