# THERMODYNAMIC FORMULATION OF CORROSION-CRACKING COUPLING IN REINFORCED CONCRETE FRAMES

## Palavras-chave:

Corrosion by chloride ions, Damage mechanics, Plastic hinge, Reinforced concrete frames, Thermodynamics of solids## Resumo

The objective of this work is to propose a mathematical model for the coupling of corrosion,

cracking and plasticity in the analysis of reinforced concrete structures. The corrosion phenomenon is

considered due to chloride ions in the concrete that causes the reduction of the cross section of the steel

bars and the penalization of the yield stress. The modeling of structural behavior is based on lumped

damage mechanics and the laws of the thermodynamics of solids. The model proposed in this work is

called elastoplastic with linear kinematic hardening, damage and corrosion; its internal variables are

plastic rotation, damage level and corrosion level. The proposed model was used for the simulation of a

reinforced concrete slab. In the simulation, the model represents the increase of the corrosion resulting

from increments of cracking. Accelerating the corrosive process, damage evolution causes the reduction

of the corrosion time for the appearance of the first plastic hinge.