Fracture energy based bi-dissipative damage model for concrete. (English) Zbl 0996.74069

Comi, Claudia; Perego, Umberto

Int. J. Solids Struct. 38, No. 36-37, 6427-6454 (2001).

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

Keywords:

bi-dissipative model; isotropic damage model; concrete; tension; compression; fracture-energy-based regularisation