Abstract
A detailed cyclic micromechanical model based on the micromechanics of granular material is proposed for concrete. In the current study, concrete is idealized to have two kinds of contacts; aggregate-aggregate and aggregate- mortar contacts. The behavior of these contacts is examined and distinguished for both cyclic and virgin loadings. Finally, an explicit formula which expresses the tangent stiffness matrix of the material as a summation of the contributions of all contacts inside any representative volume is derived. Moreover, the nonhomogeniety of the microstructure and the nonuniformity of strain distribution are considered. This is in contrast to Bazant's microplane model in which concrete has been treated as a homogenous brittle aggregate material having a single kind of contact with uniform strain distribution.
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