The implementation of the Maekawa model in DIANA was initiated by a working group consisting of Japanese universities and companies in the period 2001-2002. Initially the implementation was based on the Elasto-Plastic Fracture model which describes nonlinear concrete behaviour under compressive loading. This model was, combined with Cracked Concrete curves, based on the Total Strain crack model in DIANA and was called Modified Maekawa concrete model.
In addition to the original modified Maekawa model implementation, the Maekawa Cracked Concrete curves have been made available in the Total Strain crack model in DIANA 9.5. Therefore, the Total Strain framework has been extended such that nonlinear unloading and reloading curves can be applied. These features can be selected in the Total Strain crack model where the Maekawa Cracked Concrete cuves are chosen for the compressive behaviour curve. Either the JCSE tension stiffening or tension softening is chosen for the tensile behaviour.
The Total Strain crack model is restricted to maximum three orthogonal cracks in every integration point, but Maekawa and Fukuura state that three orthogonal cracks per integration point may be insufficient to get a realistic description of complex cyclic loading of reinforced concrete. In response to this, the Modified Maekawa concrete model has been re-engineered again in DIANA 10 into the Maekawa-Fukuura concrete model. The Maekawa-Fukuura model in DIANA 10 is similar to the definition of Maekawa and Fukuura.
FULL DOWNLOAD: DIANA MAEKAWA-FUKUURA CONCRETE MODEL - VERIFICATION DOCUMENT (.PDF 63KB)