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Long-time fatigue properties of high yield reinforcing bars

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Abstract

Fatigue tests were conducted on beam specimens containing reinforcing bars. 6 bars from five US manufacturers were evaluated. Each bar was embedded as main reinforcement in a concrete beam. 5 bars were evaluated at target stress ranges of 2 ksi (13.8 M Pa) below the mean fatigue limit at 5 million cycles. 1 bar was loaded at a target stress range of 4 ksi (27.6 M Pa) below the mean fatigue limit. Bars in five specimens fractured due to fatigue. Failures occurred between 31 and 471 million cycles of repetitive loading. 1 bar survived over 1 billion cycles. It is concluded that at a stress range below the fatigue limit set in the AASHTO Specifications, straight reinforcing bars will survive the stress induced cycles during the service life of a highway bridge without fracture. Deflection measurements during fatigue loading showed creep under cyclic loading.

Résumé

On a réalisé des essais de fatigue sur des poutres d'épreuve armées. Six fers à béton de cinq fabricants américains ont été évalués. Chaque fer a été placé comme armature principale dans une poutre de béton. Pour cinq fers on s'est fixé des gammes de contraintes de 13,8 M Pa sous la limite moyenne de fatigue à 5 millions de cycles. L'un des fers a été chargé en visant un ordre de contrainte de 27,6 M Pa sous la limite moyenne de fatigue.

Les fers de cinq des corps d'épreuve se sont rompus en fatigue. Les ruptures se sont produites entre 31 et 471 millions de cycles de charges répétées. L'un des fers a survécu à un million de cycles. On en conclut que pour un ordre de contrainte sous la limite de fatigue définie dans les spécifications AASHTO, les fers d'armature droits endureront sans rupture les contraintes induites par des charges cycliques dans la durée de service d'un pont-route. La mesure des flèches accusées sur/sous chaque charge de fatigue montre du fluage sous sollicitation cyclique.

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References

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Authors and Affiliations

  1. Structural Experimental Section and Divisional Director, Engineering Development Division, Construction Technology Laboratories, a division of the Portland Cement Association, 60077, Skokie, Illinois, USA

    B. G. Rabbat & W. G. Corley (Senior Structural Engineer)

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  1. B. G. Rabbat
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  2. W. G. Corley
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Rabbat, B.G., Corley, W.G. Long-time fatigue properties of high yield reinforcing bars. Mat. Constr. 17, 35–38 (1984). https://doi.org/10.1007/BF02474053

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  • DOI: https://doi.org/10.1007/BF02474053

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