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 solidsResumo
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.
