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During their service life, existing structures may suffer a combination of ageing and reinforcement corrosion. The corrosion deterioration can significantly affect the durability of reinforced concrete (RC) elements causing premature concrete crushing, size reduction of reinforcement cross-section, degradation of mechanical properties of steel and concrete, and stirrups rupture. One of the main purposes related to durability reduction is the evaluation of the maintenance of adequate safety and residual capacity throughout the life of the structure. For this reason, a non-linear finite element approach (NLFEA), based on multi-layer shell elements and PARC_CL 2.1 crack model has been presented in this paper. The PARC_CL 2.1 model is a fixed crack model developed at the University of Parma and implemented in a subroutine UMAT for ABAQUS that incorporates cyclic constitutive laws of materials and the evolution of corrosion over time. In the present work, the crack model was improved by implementing the effects of exposure to environmental attack. Firstly, the effectiveness of the proposed model has been validated through comparison with experimental data available in literature. The residual capacity of corroded RC panels subjected to cyclic loads was then investigated over time considering different exposure classes. Based on the obtained results, the capacity reduction in terms of maximum shear stress and ductility have been estimated over time.
Lorenzo Franceschini; Francesca Vecchi; Beatrice Belletti. The PARC_CL 2.1 Crack Model for NLFEA of Reinforced Concrete Elements Subjected to Corrosion Deterioration. Corrosion and Materials Degradation 2021, 2, 474 -492.
AMA StyleLorenzo Franceschini, Francesca Vecchi, Beatrice Belletti. The PARC_CL 2.1 Crack Model for NLFEA of Reinforced Concrete Elements Subjected to Corrosion Deterioration. Corrosion and Materials Degradation. 2021; 2 (3):474-492.
Chicago/Turabian StyleLorenzo Franceschini; Francesca Vecchi; Beatrice Belletti. 2021. "The PARC_CL 2.1 Crack Model for NLFEA of Reinforced Concrete Elements Subjected to Corrosion Deterioration." Corrosion and Materials Degradation 2, no. 3: 474-492.
The geometric morphology of pits induced by corrosion has been investigated. To this aim, twenty-four seven-wire strands coming from 10 years old naturally corroded prestressed concrete beams have been analysed. The cross-sections of corroded strands were measured and examined in detail. The morphology of corrosion pits has been recorded by using a structured light 3D scanner and classified in terms of maximum pit depth, longitudinal dimension, and transversal width. Then, a new method for the approximate evaluation of the average pit depth of prestressing strands has been proposed. Finally, the pitting factor of the corroded samples has been calculated.
Francesca Vecchi; Lorenzo Franceschini; Francesco Tondolo; Beatrice Belletti; Javier Sánchez Montero; Paolo Minetola. Corrosion morphology of prestressing steel strands in naturally corroded PC beams. Construction and Building Materials 2021, 296, 123720 .
AMA StyleFrancesca Vecchi, Lorenzo Franceschini, Francesco Tondolo, Beatrice Belletti, Javier Sánchez Montero, Paolo Minetola. Corrosion morphology of prestressing steel strands in naturally corroded PC beams. Construction and Building Materials. 2021; 296 ():123720.
Chicago/Turabian StyleFrancesca Vecchi; Lorenzo Franceschini; Francesco Tondolo; Beatrice Belletti; Javier Sánchez Montero; Paolo Minetola. 2021. "Corrosion morphology of prestressing steel strands in naturally corroded PC beams." Construction and Building Materials 296, no. : 123720.