Numerical investigations on post-fire bond behaviour of reinforcement in concrete

  • Arunita Das Institute of Construction Materials Fastening and Strengthening Methods, University of Stuttgart
  • Josipa Bošnjak Materials Testing Institute, University of Stuttgart
  • Akanshu Sharma Institute of Construction Materials, University of Stuttgart
Keywords: Steel-to concrete bond

Abstract

Reinforced concrete (RC) structures may be subjected to accidental fire loads during their service life. In such a case, it is essential to have appropriate methods for the estimation of post-fire performance. One of the vital aspects for the performance of RC structures is adequate steel-to-concrete bond. The bond behaviour under ambient conditions is very well established. However, an appropriate model for the assessment of the post-fire bond capacity is still lacking. In order to provide more insight into the bond performance after fire, a 3D FE numerical study using a thermo-mechanical model with temperature dependent microplane model for concrete is performed. The effects of concrete cover, confinement through stirrups, fire duration and exposure type on post-fire bond performance are investigated using beam-end specimen. The results show a strong degradation of post-fire bond capacity, which is primarily attributed to the irreversible damage of concrete cover resulting from heating and cooling.

Published
2019-05-16
How to Cite
Das, A., Bošnjak, J. and Sharma, A. (2019) “Numerical investigations on post-fire bond behaviour of reinforcement in concrete”, RILEM Technical Letters, 4, pp. 1-8. doi: 10.21809/rilemtechlett.2019.88.
Section
Articles