Structural assessment of existing reinforced concrete structures: coupling between corrosion and earthquake loading
Description
Reinforcement corrosion is one of the main causes of the decrease in the structural performance of reinforced concrete (RC) structures over time. The literature clearly reports a very limited number of experimental studies aimed at characterizing the dynamic behavior of corroded RC structures by the means of dynamic loadings. To improve the state of knowledge in terms of dynamic behavior of corroded RC structures, an experimental campaign is conducted on large-scale RC beams. These beams are corroded using an accelerated corrosion technique and subjected to quasi-static as well as dynamic loadings. From the experimental results, the evaluation of certain quantities of interest, in particular the bearing capacity, the ductility, the hysteretic capacity, the natural frequencies and the damping ratios, is carried out. Therefore, the effect of corrosion on these different quantities is revealed and the comparison between the conclusions drawn by dynamic and quasi-static tests is established. In order to capitalize the experimental campaign results, a numerical model is developed. This multi-fibre model, with a low computational cost, integrates certain effects of corrosion pathology, in particular the localized reduction of the corroded bars section, the degradation of the mechanical properties of the steel and the concrete cover cracking. A sensitivity study of the developed model to these different components was carried out, in comparison with the experimental results. (author)
Abstract (French)
La corrosion des armatures est l'une des causes principales de la diminution de la performance structurale des ouvrages en beton arme au cours du temps. La litterature fait clairement etat d'un nombre tres limite d'etudes experimentales, visant a caracteriser le comportement dynamique des ouvrages en beton arme atteints de corrosion en considerant des sollicitions de nature dynamique. Pour pallier les manques releves dans les etudes experimentales anterieures, une campagne d'essai est conduite sur des poutres en beton arme de grande echelle. Ces poutres corrodees avec une technique de corrosion acceleree sont soumises a des chargements de nature quasi-statique aussi bien que dynamique.a partir des resultats experimentaux dynamiques et quasi-statiques, l'evaluation de certaines grandeurs d'interet, notamment la capacite portante, la ductilite, la capacite hysteretique, les frequences propres et les coefficients d'amortissement, est realisee. Des lors, l'effet de la corrosion sur ces differentes grandeurs est releve, la comparaison entre les conclusions issues d'essais dynamiques et celles issues d'essais quasi-statiques est etablie. Afin de capitaliser les resultats issus de la campagne d'essai, un modele numerique est developpe. Ce modele multifibre, a faible cout de calcul, integre certains effets de la pathologie de corrosion, notamment la reduction localisee de la section utile des barres corrodees, la degradation des proprietes mecaniques de l'acier et l'etat de fissuration du beton d'enrobage. Une etude de sensibilite du modele developpe a ces differentes composantes a ete realisee, en comparaison avec les resultats d'essais experimentaux
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Additional details
Additional titles
- Original title (French)
- Comprehension du fonctionnement dynamique de structures en beton arme en presence de corrosion
Publishing Information
- Imprint Pagination
- 183 p.
- Report number
- FRCEA-TH--14835
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 54007440
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- COMPUTERIZED SIMULATION; DAMPING; DUCTILITY; EARTHQUAKES; ENGINEERING; MECHANICAL PROPERTIES; PITTING CORROSION; REINFORCED CONCRETE
- Descriptors DEC
- BUILDING MATERIALS; CHEMICAL REACTIONS; COMPOSITE MATERIALS; CONCRETES; CORROSION; MATERIALS; MECHANICAL PROPERTIES; REINFORCED MATERIALS; SEISMIC EVENTS; SIMULATION; TENSILE PROPERTIES
Optional Information
- Notes
- 230 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses