Abstract
Concrete structures are subjected to cylic loading throughout their service life.
This article examines the changes taking place in the mechanical properties of concrete specimens under a limited number of compressive loading cycles involving high loads.
Furthermore the variations in specimen temperature occurring during load application (1 hour, at 1 Hz frequency) were measured and analysed.
The results obtained show that cyclic loading makes it possible to increase failure strength and, at the same time, causes an increase in material brittleness.
Furthermore, it has been demonstrated that there is a correlation between the decrease in temperature and the increase in strength brough about by cyclic loading.
Résumé
Les ouvrages en béton sont soumis à des charges cycliques au cours de leur durée de vie en service.
Cet article examine les changements se produisant dans les propriétés mécaniques des échantillons en béton soumis à un certain nombre de charges cycliques dues à la compression, incluant des changes élevées.
En outre, les variations de température des spécimens lors de l'application des charges (1 heure, à une fréquence de 1 Hz) ont été mesurées et analysées.
Les résultats obtenus montrent que le chargement cyclique rend possible l'accroissement de la résistance à la rupture, et, en même temps, entraîne une hausse de la fragilité du matériau.
Par ailleurs, il a été démontré qu'il existe une corrélation entre la baisse de température et l'augmentation de la résistance provoquée par le chargement cyclique.
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Abbreviations
- σfailure[daN/cm2]:
-
Stress at failure
- σmax[daN/cm2]:
-
Max. imposed testing stress
- εf :
-
Strain at failure
- εt :
-
Conventional post-failure strain (=5*εf)
- F 1/s:
-
Frequency of application of loading cycles
- n:
-
Number of cycles
- T °C:
-
Temperature
- ΔT °C:
-
Difference in temperature recorded in the test pieces during cyclic loading tests
References
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Bocca, P., Crotti, M. Variations in the mechanical properties and temperature of concrete subjected to cyclic loads, including high loads. Mat. Struct. 36, 40–45 (2003). https://doi.org/10.1007/BF02481569
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DOI: https://doi.org/10.1007/BF02481569