MESOSCOPIC NUMERICAL MODEL TO SIMULATE DEGRADATION AND ULTIMATE LOAD CARRYING CAPACITY IN REINFORCED CONCRETE STRUCTURES AFFECTED BY CORROSION

PABLO SÁNCHEZ; ALFREDO HUESPE; JAVIER OLIVER; SEBASTIAN TORO

San Luis

Congreso; XVII Congreso sobre Métodos Numéricos y sus Aplicaciones - ENIEF 2008; 2008

Asociación Argentina de Mecánica Computacional, Departamento de Matemáticas - Facultad de Ciencias Físico Matemáticas y Naturales - Universidad Nacional de San Luis y CIMEC - INTEC - UNL - Conicet

Abstract. In this research work, a finite element strategy specially devised to simulate the structural degradation of corroded reinforced concrete members is presented. The proposed model is able to reproduce many of the mechanical effects induced by corrosion processes in the embedded steel bars and, mainly, their influences on the structural ultimate load carrying capacity predictions. For this purposes, two different and coupled mesoscopic problems are considered. This mechanical model can be used to simulate generalized or localized reinforcement corrosion. Each component of the RC structure is modeled by means of a suitable FE formulation. For the concrete, a cohesive model based on the Continuum Strong Discontinuity Approach (CSDA) is used. The steel reinforcement bars are simulated by means of a elasto-plastic model. The steel-concrete interface is simulated using contact-friction elements with the friction degradation as a function of the depth of corrosion attack. Experimental and previous numerical solutions are used to compare and validate the proposed models.