ABSTRACT
Noticing the above facts, we aim to develop a new microplane model, which is not only capable of good data fitting but thermodynamically consistent. This paper is the first step of this work, in which a unified microplane theory was proposed within the framework of irreversible thermodynamics. The general formulation, including the consistent evolution laws of the involved internal variables, was presented in detail. As illustrative examples, by adopting different microplane unloading/reloading stiffness, the microplane elastoplastic, damage, and combined elastoplastic damage models were derived as the special cases of the proposed theory. Finally, the proposed model was applied to concrete under cyclic uniaxial compression and biaxial compression, respectively, and the numerical predictions were also presented to preliminarily verify its validity.
