Concrete damage plasticity

Concrete Damage Plasticity (CDP) is one of the constitutive models that can efficiently and accurately describe the behavior of concrete type materials under different conditions of loading. Several laboratory tests are necessary to identify the CDP model, as introduced and further developed by Kachanov (1986), Rabotnov (1969) and others. The elastic-plastic response of the concrete damaged plasticity model is described in terms of the effective stress and the hardening variables with... 

Mechanical assumptions. Aggregates are assumed to be purely elastic whereas the bulk matrix of mortar and the transition zone follow the Lubliner s damaged plasticity law. CEB-FIP model is used to define ID tensile and compressive behaviors [3]. This model depends mainly on a single input the compressive strength of the material. In this study, an ordinary concrete with a water-to-cement ratio of 0.4 is considered. After [2], the capillary porosity of the corresponding hardened cement paste with a degree of hydration of 0.83 is 0.176. However the introduction of a granular skeleton modifies the bulk matrix and decreases its porosity. To take into account this phenomenon, [4] proposed to link the porosity of the various zones of the matrix by Eq.l. 

The waterproofing body underneath the mat may be a plastic membrane, a thin aluminium sheet, or a bituminous/ concrete bed. These mats may be loosely placed or may be glued at certain points on the sub-layer. When placed on the concrete or on the asphalt, point forces may be exerted by the underlying aggregate. In addition, during construction activities, falling of reinforcements and other objects may induce local damage in the mat and in the... 

The new material composition on the CSPE base with Structure 5.1 and vulcanized by a water solution of MAs provides the formation of a saturated polymer vulcanized net. This makes it possible to obtain impenetrable crack-resistant coatings for metal, concrete, plastic, and other substrates, protecting them from damaging effects of the environment. 

In the FEM simulations, pinned support (Ux = 0, Uy = 0, and Uz = 0) was assumed at the base of the walls. The Plastic Damage model available in ABAQUS was also adopted in the simulations. The materials used in the walls were concrete (concrete brick tmits) and mortar (head/bed joints between bricks). Both materials have been considered as a continuum media and simulated using the continuum damage model. The only material properties available in (Li et al. 2005) were the concrete and mortar ultimate compression strengths. Other needed data was extracted using ACI formulas. Some of the parameters needed in the Plastic... 

Kachanov LM (1986) Introduction to continuum damage mechanics. Springer, New York Lee J, Fenves GL (1998) Plastic-damage model for cyclic loading of concrete structures. J Eng Mech ASCE 124(8) 892-900... 

Li T, Galati N, Tumialan G, Nanni A (2005) Analysis of unrernforced masonry concrete walls strengthened with glass fiber-reinforced polymer bars. Struct J 102(4) 569-577 Lubliner J, Oliver J, Oiler S, Onate E (1989) A plastic-damage model for concrete. Int J Solids Struct 25(3) 299-326... 

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