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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.

MSC:
74R20 Anelastic fracture and damage
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