Proc. Computational Modelling of Concrete Structures (EURO-C),
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
AND ITS IDENTIFICATION FROM TESTS WITH LOCALIZED DAMAGE

Z.P. Bazant, M. Jirásek, Y. Xiang and P. Prat
Northwestern University
Evanston, Illinois 60208, U.S.A.


Abstract

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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EPFL / July 1, 1996 / Milan.Jirasek@epfl.ch