Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Reinforced Concrete Time-Dependent Reliability Considering Penetration of Chlorides via Boundary Element Method
Submission Author:
Henrique Machado Kroetz , PR
Co-Authors:
Henrique Machado Kroetz, Giovanni Pais Pellizzer, Edson Denner Leonel, Andre Beck
Presenter: Henrique Machado Kroetz
doi://10.26678/ABCM.MECSOL2019.MSL19-0069
Abstract
The degradation of structural materials is an inevitable process, since they are over time subjected to several deleterious physical-chemical phenomena, interfering with the structural performance. Especially in reinforced concrete structures, corrosion of reinforcing bars caused by chloride ions is one of the main pathological manifestations. Chloride ions diffuse through the microstructure of the concrete and when they reach a significant concentration at the concrete / steel interface, the corrosive process is initiated. For a complete analysis of the structural life, it is fundamental that the approach used to predict the behavior of the structure encompasses both the diffusion mechanism and the mechanical degradation of the steel reinforcement in the concrete. Since the process involves a significant amount of uncertainties a reliability analysis is necessary in this context. The present work presents a model that is capable of providing responses in terms of failure probabilities for reinforced concrete structures submitted to mechanical loads and penetration of chloride ions. The diffusion of chloride ions is modeled by using the boundary element method while the mechanical charges are generated by means of stochastic processes. Two examples are shown, demonstrating the capacity of the proposed model.
Keywords
reinforced concrete, corrosion, time-dependent reliability, Boundary Element Method
