Résumé
Il apparaît que les connaissances que nous possédons sur le comportement dynamique du béton sont encore insuffisantes et trop fragmentaires. Afin d’obtenir une représentation analytique correcte des liaisons rhéologiques, il a été entrepris un important travail expérimental conçu pour fournir le contrôle simultané et combiné des différents facteurs en jeu: vitesse des déformations, amplitude des variations de contrainte, gradients des contraintes, contraintes moyennes, état physique, armatures métalliques, etc..
Cette étude nous a donné une vue générale, et cependant détaillée, du comportement dynamique du béton comme du béton armé exempt de fissures, mettant en lumière ainsi certains aspects et corrélations qui jusqu’alors semblaient être obscurs ou qui n’apparaissaient pas.
L’adoption de techniques spéciales pour révéler les pertes d’énergie parasites a, en outre, montré la facilité avec laquelle certains phénomènes dans un système dynamique pouvaient se dérober à l’observation, ce qui a pu peut-être aussi, se produire parfois, pour des caractéristiques du matériau.
Summary
In the field of concrete dynamics the knowledge so far available has been too disjointed and scanty. To enable a sound analytical arrangement of rheological bonds, we have therefore carried out a vast experimental work, devised to allow simultaneous and cross controls of the several quantities in play: velocity of strains, amplitude of stress excursions, stress gradients, average stresses, physical state, metallic reinforcement, etc.
This investigation has given us a general, yet detailed, picture of the dynamic behaviour of concrete, or non-fissured reinforced concrete, clearing up some aspects and correlations that until now seemed to be confused, or did not appear at all.
The adoption of special techniques to reveal parasitic energy dissipations, has further shown us how easily certain behaviour in a dynamic system can be confused, and perhaps it has at times happened, for a peculiarity of the material.
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This Paper, in concise form, was presented at the “2° Convegno Nazionale del Gruppo di Studio C.N.R. sulla Ingegneria Sismica”, Camogli (Genova), Nov. 1966. Work carried out under grant of the C.N.R.
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Pozzo, E. The rheological behaviour of the dynamically stressed concrete. Mat. Constr. 1, 411–424 (1968). https://doi.org/10.1007/BF02473739
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DOI: https://doi.org/10.1007/BF02473739