Outline_03 - 1.054/1.541 Mechanics and Design of Concrete...

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1.054/1.541 Mechanics and Design of Concrete Structures Spring 2004 Prof. Oral Buyukozturk 1 / 1 4 Massachusetts Institute of Technology 1.054/1.541 Mechanics and Design of Concrete Structures (3-0-9) Outline 3 Failure Theories and Concrete Plasticity Failure of concrete o Concrete 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 behavior o In general the material properties are known from simple tests such as uniaxial loadings giving ' c f and t f . Prediction involves strength calculation in multiaxial situations given the data from the uniaxial tests. o In 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: 3 σ 2 σ 3 σ 1 σ 1 σ 3 σ 2 σ 2 σ 1 σ
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