Proc. Computational Modelling of Concrete
Innsbruck, Austria, March 22-25, 1994,
ed. H. Mang, N. Bicanic and R. de Borst, Pineridge Press, Swansea, 255-261.
MICROPLANE MODEL WITH STRESS-STRAIN BOUNDARIES
Z.P. Bazant, M. Jirásek, Y. Xiang and P. Prat
AND ITS IDENTIFICATION FROM TESTS WITH LOCALIZED DAMAGE
Evanston, Illinois 60208, U.S.A.
The paper deals with the microplane model for nonlinear triaxial
behavior of quasibrittle material such as concrete and its method of
identification from test data. In the microplane model, the constitutive
behavior is characterized by relations between the stress and strain components
on planes of various orientation in the material, called the microplanes,
which are constrained to the macroscopic strain tensor. Certain limitations
of the recently developed microplane model are pointed out and an improvement
avoiding these limitations is proposed. The idea is to introduce stress-strain
boundary curves on the microplane level. Further, a simple method to take
into account the localization of strain softening damage within test specimens
in the identification of the stress-strain relation from test data is proposed.
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July 1, 1996 /