## The behavior of a model of plain concrete subject to compression-tension and tension-tension biaxial stresses |

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aggregate analysis analytical and experimental assumed average principal tensile average strains average tensile strain axial behavior of concrete biaxial compression Biaxial Stress Buyukozturk comb-platens compres compression-tension compressive loads compressive strength compressive stresses concrete model crack length crack patterns crete deformations direct tensile discontinuity envelope discontinuity point discontinuity stresses distortion energy effect elastic limit elastic modulus epoxy Equation experimental and analytical failure criterion failure envelope failure of concrete Figure finite element method fracture mechanics increase interface failure law interface stresses mean normal stress microcracks microstrain model of concrete mortar cracks Non-Dimensional obtained Plain Concrete Poisson's ratio present principal tensile strain quadrant real concrete shear strength shear stresses slow-crack-growth specimen strain at discontinuity strain curve strain energy strain gages Strength of Concrete stress at discontinuity stress-ratios surface technique tensile load tensile strength tensile stress tension tests tension-shear tension-tension ultimate strength uniaxial compression uniaxial tension water-cement ratio y-direction