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Fracture energy based bi-dissipative damage model for concrete. (English) Zbl 0996.74069
Summary: We present an isotropic damage model for concrete. The main features of the model are: limited number of constitutive parameters required; independent modelling of tension and compression behaviour by means of two damage variables and two separate activation criteria (bi-dissipative model); independent definition of tension and compression fracture energies by means of constitutive parameters which do not affect the pre-peak behaviour; consistent modelling of the unilateral effect on transition from tension to compression. To overcome the problem of mesh dependence in the softening regime, we demonstrate the effectiveness of a fracture-energy-based regularisation strategy, and determine conditions for its correct application. Comparisons of numerical simulations with experimental tests reveal the good accuracy and robustness of the proposed model.

74R20 Anelastic fracture and damage
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