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The paper presents an improvement of the microplane model for concrete-a con~titutive model in which the nonlinear triaxial behavior is characterized by relations between ~e stress and stram cr compression the stress-strain boundaries are defined on the microplanes separately for volu~etric ~d .devlatonc compon~nts, for tension an additional boundary is defined in terms of the total normal str~~s. This IS .necess~ to .ac~eve a realistic triaxial response at large tensile strains. F?r mic~plane shear, a fnc~on law WI~ coheSion IS mtr

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