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


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.

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, 40, pp. 1-8. doi: 10.21809/rilemtechlett.2019.88.