On Development of Suitable Stress Fields for Structural Concrete

Strut and tie models and stress fields are methods that can be used for the dimensioning and detailing of reinforced and prestressed concrete structures as well as for the check of existing ones. This paper presents an innovative approach towards the automatic development of stress fields based on a nonlinear finite element analysis. Strut and tie models can also be easily developed from the resulting stress fields. Most of the difficulties of the existing methods for developing stress fields and strut and tie models based on elastic uncracked analyses are overcome. Its application to the dimensioning of structural members in practical cases is detailed and several comparisons with experimental results are discussed.

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Concepts associés (2)

Prestressed concrete

Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" (compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Tendons may consist of single wires, multi-wire strands or threaded bars that are most commonly made from high-tensile steels, carbon fiber or aramid fiber.

Béton armé

vignette|Armatures métalliques de renforcement du béton. vignette|« Cancer du béton » : lorsque le front de carbonatation atteint l'armature métallique, celle-ci est atteinte de rouille qui fait augmenter le volume de l'acier, conduisant à l'éclatement du béton d'enrobage, ce qui provoque des délaminations, ou comme ici des épaufrures qui mettent à nu les armatures oxydées. Le béton armé est un matériau composite constitué de béton et de barres d'acier alliant les propriétés mécaniques complémentaires de ces matériaux (bonne résistance à la compression du béton et bonne résistance à la traction de l'acier).