Efecto de escala en la fatiga a compresión de hormigón con fibras

  1. J. J. Ortega 1
  2. G. Ruiz 2
  3. E. Poveda 2
  4. D. C. González 3
  5. M. Tarifa 4
  6. X. X. Zhang 5
  7. R. C. Yu 2
  8. M. Á. Vicente 3
  9. Á. de la Rosa 2
  10. L. Garijo 6
  1. 1 ETSI Minas y Energía, Universidad Politécnica de Madrid
  2. 2 ETSI Caminos, C. y P., Universidad de Castilla-La Mancha
  3. 3 E. Politécnica Superior, Universidad de Burgos
  4. 4 ETSI Aeronáutica y del Espacio, Universidad Politécnica de Madrid
  5. 5 EI Minera e Industrial de Almadén, Universidad de Castilla-La Mancha
  6. 6 Instituto ISISE, Escola de Engenharia, Universidade do Minho
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Revista:
Revista española de mecánica de la fractura

ISSN: 2792-4246

Any de publicació: 2021

Número: 1

Pàgines: 205-209

Tipus: Article

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Altres publicacions en: Revista española de mecánica de la fractura

Resum

The present work experimentally studies the size effect on the compressive fatigue life obtained from cubes of steel fibrereinforced concrete. For that purpose, specimens of three different sizes were produced, with edge lengths of 40 mm, 80 mm and 150 mm. A short fibre type of 13 mm was used to guarantee the homogeneity of the material in the smallest specimens. The mean values of compressive strength resulted the same for the three sizes. This result is due to the ductility provided by the fibre reinforcement to the concrete matrix within this range of sizes. However, the probabilistic distribution of the values of cycles to failure obtained from the cubes of edge length 40 mm shows a much higher fatigue life compared to the other two specimen sizes. Furthermore, the compressive strength obtained after the fatigue test from run-out specimens of 40 mm increased a 42% in average with respect to the original reference value. This is due to a curing effect induced by the application of the cyclic load that is not observed in the two larger sizes.

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