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Mechanical behaviour of corroded reinforced concrete beams—Part 1: Experimental study of corroded beams

Content Provider	Springer Nature Link
Author	Castel, A. François, R. Arliguie, G.
Copyright Year	2000
Abstract	Steel corrosion in reinforced concrete leads to crack occurrence along the reinforcement (secondary cracks), to a reduction in bond strength and a reduction in steel cross section. The purpose of this study is to determine the effect of these deteriorations on the global behaviour of reinforced concrete structural elements in their service and ultimate states. Mechanical experimentation was carried out on fourteen-year-old reinforced concrete beams, on two control elements and two corroded beams. A comparative analysis of the results obtained on the beams showed that concrete cracking in the compressive area had no significant influence on the behaviour in service of the corroded elements. However, significant modifications of service behaviour were observed, due to the degradations in the tensile zone, namely: loss of bending stiffness, dissymmetrical behaviour. Finally, the measure of the residual steel cross-section of the corroded re-bars showed that the loss of bending stiffnes due to steel corrosion cannot be merely explained in terms of steel cross-section reduction. Concerning the ultimate behaviour, the loss of steel cross-section is the main parameter which leads to a reduction of bearing capacity and ductility. Another part will explain the separate and coupling effects of bond strength and steel cross-section loss on the mechanical behaviour of corroded beams.La corrosion des armatures dans le béton armé entraîne une fissuration du béton d’enrobage qui traduit à la fois une réduction de section des aciers et une perte d’adhérence acier-béton. L’objectif de ce travail est d’étudier l’influence de ces dégradations sur le comportement global, en service puis à rupture, des éléments de structure. Pour ce faire, des expérimentations mécaniques ont été réalisées sur des poutres corrodées, ceci en comparaison avec le comportement d’éléments témoins. L’analyse comparative des résultats obtenus a montré que la fissuration du béton comprimé n’a pas d’influence sur le comportement en service. En effet, ce sont les dégradations en partie tendue qui entraînent des modifications importantes, notamment une réduction de la raideur en flexion et un comportement dissymétrique. De plus, l’analyse des taux de corrosion le long des armatures tendues semble montrer que la perte d’adhérence acierbéton a une influence très significative. En ce qui concerne le comportement à rupture, la réduction de section d’acier est le seul paramètre déterminant. Elle entraîne une diminution de la capacité portante et de la ductilité. Une seconde partie sera dédiée à l’étude plus détaillée de l’effet couplé ou découplé de la réduction de section d’acier et de la perte d’adhérence acier-béton en partie tendue sur le comportement mécanique local et global des poutres corrodées.
Starting Page	539
Ending Page	544
Page Count	6
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	33
Issue Number	9
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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