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Résistance au choc des structures en béton : du comportement du matériau au calcul des ouvrages

Abstract : The present thesis may be considered as a first step to control the shock strength of concrete structures. It has contributed to developping the knowledge about the material dynamic behaviour in order to improve the design of structures against accidental loadings. In a first part the physical mechanisms that were pointed out by direct tensile tests, at gradual strain rates from the quasi-static regime up to the domain of hard shocks (Hopkinson Bars technique) are listed. Several expressions of the strength evolution versus the strain rate are proposed, accounting for the influence of characteristic material parameters. An optimization of the concrete mix-design regarding high rate loadings has been considered. In a second part the shock tube test of concrete slabs is described. This testing process was developped in order to validate at the level of an ideal structure the results that had been obtained at the material level. Data recorded on 24 slabs constituted of different reinforced or unreinforced concretes are presented in details. Analyzing such data allows checking different approximated design methods, and defining the absolute requirements of more sophisticated dynamic computational modellings, that are still to be processed.
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  • HAL Id : tel-00529490, version 1

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François Toutlemonde. Résistance au choc des structures en béton : du comportement du matériau au calcul des ouvrages. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1994. Français. ⟨tel-00529490⟩

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