1.054/1.541 Mechanics and Design of Concrete Structures Spring 2004Prof. Oral Buyukozturk 1 / 1 4Massachusetts Institute of Technology1.054/1.541 Mechanics and Design of Concrete Structures (3-0-9) Outline 3 Failure Theories and Concrete PlasticityFailure of concreteoConcrete is a brittle material which fails through brittle cleavage (splitting) at the interfaces and in mortar except for high triaxial compression where shear slippage occurs resulting in a ductile behavior. Failure occurs by tensile splitting with the fractured surface orthogonal to the direction of the maximum tensile stress or strain.Prediction of multiaxial behavioroIn general the material properties are known from simple tests such as uniaxial loadings giving 'cfand tf. Prediction involves strength calculation in multiaxial situations given the data from the uniaxial tests.oIn the field of concrete research attempts have been made to apply some of the classical failure theories to concrete. These theories were altered to overcome some disadvantages or otherwise improve their agreement with the phenomenological behavior of concrete. New failure theories were therefore formed.Principal stresses:3σ2σ3σ1σ1σ3σ2σ2σ1σ
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