Abstract
Although the great advances in concrete technology have led to the possibility of obtaining ready-mix concrete with compressive strength around 100 MPa, some national and international codes for concrete structures do not cover concrete strengths above 50 MPa. Many codes are under revision, but some of them (including the Brazilian Code) will still not include high strength concretes.
Due to the different characteristics of higher strength concrete some design procedures traditionally used in normal strength concrete structures have to be changed.
Different types of stress-train relationships for concrete have been proposed for the non-linear analysis of member behavior and for the ultimate state analysis of high strength concrete elements under combined flexure and axial load.
In this work comparisons are made between proposed stress-strain curves and between the axial load-moment interaction diagrams based on these curves. Comparisons of test results with these diagrams, for columns subjected to eccentric compression, give an idea of the different degrees of safety obtained using those curves.
Résumé
Malgré les grands progrès de la technologie en matière de béton, qui ont rendu possible l'obtention de bétons résistant à une compression d'environ 100MPa, quelques codes nationaux et internationaux relatifs aux constructions en béton ne couvrent pas des résistance du béton supérieures à 50 MPa. Plusieurs codes sont en cours de révision, mais beaucoup (dont le code brésilien) ne s'intéressent toujours pas aux bétons à haute résistance.
En raison des différentes caractéristiques des bétons à haute résistance, certains procédés de définition traditionnellement utilisés pour les constructions en béton normal doivent être modifiés.
Différents types de relations contraintes—déformations ont été proposés pour le béton dans le cadre de l'analyse non-linéaire de son comportement et dans celui de l'analyse finale des éléments en béton armé en flexion combinée avec une charge axiale.
Cet article compare les courbes contraintes—déformations proposées et les diagrammes interaction charge axiale—moment qui résultent de ces courbes. Les comparaisons effectuées entre les résultats expérimentaux et ces diagrammes, pour des colonnes soumises à des compressions excentriques viennent illuster les différents degrés de sécurité obtenus grâce à ces courbes.
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Shehata, I.A.E.M., Shehata, L.C.D. & Mattos, T.S. Stress-strain curve for the design of high-strength concrete elements. Mat. Struct. 33, 411–418 (2000). https://doi.org/10.1007/BF02480659
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DOI: https://doi.org/10.1007/BF02480659