Lattice discrete modeling of concrete under compressive loading: Multiscale experimental approach for parameter determination

Lattice Discrete Particle Models (LDPM) effectively relate concrete heterogeneity, in terms of coarse aggregate-paste structure, to damage patterns and load-displacement response. Interest in this type of model is enhanced by its abilities to overcome issues that plague traditional methods, such as mesh dependence and needs fo renergy regularization. Herein, an experimental procedure is developed to identify the mechanical parameters defined at the concrete mesoscale. The bounding surface of the LDPM is modified to accept the mesoscale parameters as inputs. Based on the parameter values, identified through the multiscale experimental campaign, macroscopic response to compressive load is simulated. Accuracy of theapproach is demonstrated through comparisons with experimental results