Abstract
The effects of long-term loading on plain (PLC) and steel fibre reinforced concrete (SFRC) rings under two-edge sustained load at five different levels were investigated. The results have led to the conclusion that a linear relationship between the initial and time-dependent deformations can be supposed. The intercept term of the regression straight line was found to be equal to the deformation caused by pure shrinkage. In spite of cracks appearing at higher loading levels the linearity was not distorted. The results indicate that an exponential function including one retardation time can be applied in practical computation of long-term deformations.
Resume
On a étudie le comportement d’anneaux de béton non armé (PLC) et de béton renforcé de fibres d’acier (SFRC) chargés au bord dans deux directions différentes sous cinq charges différentes. Les résultats laissent supposer qu’il peut exister une relation entre les déformations initiales et celles qui se développent avec le temps. On a trouvé que l’intercept de la ligne droite de régression était égal à la déformation déterminée par le seul retrait. En dépit des fissures qui apparaissent à des niveaux de charges plus élevés, on n’a pas observé de distortion de la linéarité. Les résultats montrent qu’on peut appliquer une fonction exponentielle comprenant un temps de retard au calcul pratique des déformations à long terme.
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Nürnbergerová, T., Babál, B. Long-term behaviour of plain and steel fibre reinforced concrete rings. Materials and Structures 25, 412–416 (1992). https://doi.org/10.1007/BF02472257
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DOI: https://doi.org/10.1007/BF02472257