Modified beam-end test setup to study the bond behavior of reinforcement in concrete after fire

Modified beam-end test setup to study the bond behavior of reinforcement in concrete after fire Temperature-dependent bond behavior has so far been investigated primarily using small cylindrical pull-out specimens in steady-state conditions. In this work, a new test setup is developed to investigate the bond behavior between reinforcing bars and concrete after fire. The setup uses beam-end specimens, which simulate the boundary conditions in flexural members more closely than the pull-out specimens. The major advantage is that different parameters can be easily varied. A previously conducted numerical study indicated the suitability of beam-end specimens to evaluate the bond performance after fire. In this work, pilot experiments were performed using beam-end specimens after exposure to the standard ISO 834 fire for 30 min. Accompanying reference specimens were tested at room temperature without exposure to fire. The details of the test setup and the results are reported in this paper. It is found that the existing test data obtained using pull-out specimens in steady conditions might not be conservative under realistic boundaries and loading. This result underlines the need to modify the experimental approach, in order to be able to realistically predict the performance of steel-to-concrete bond. In order to validate the thermo-mechanical numerical model employed in the previous numerical work, the tests were also numerically simulated. The results of the numerical analysis were found to be in good agreement with the experimental results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials and Structures Springer Journals

Modified beam-end test setup to study the bond behavior of reinforcement in concrete after fire

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Publisher
Springer Journals
Copyright
Copyright © 2018 by RILEM
Subject
Engineering; Structural Mechanics; Materials Science, general; Theoretical and Applied Mechanics; Operating Procedures, Materials Treatment; Civil Engineering; Building Materials
ISSN
1359-5997
eISSN
1871-6873
D.O.I.
10.1617/s11527-018-1138-7
Publisher site
See Article on Publisher Site

Abstract

Temperature-dependent bond behavior has so far been investigated primarily using small cylindrical pull-out specimens in steady-state conditions. In this work, a new test setup is developed to investigate the bond behavior between reinforcing bars and concrete after fire. The setup uses beam-end specimens, which simulate the boundary conditions in flexural members more closely than the pull-out specimens. The major advantage is that different parameters can be easily varied. A previously conducted numerical study indicated the suitability of beam-end specimens to evaluate the bond performance after fire. In this work, pilot experiments were performed using beam-end specimens after exposure to the standard ISO 834 fire for 30 min. Accompanying reference specimens were tested at room temperature without exposure to fire. The details of the test setup and the results are reported in this paper. It is found that the existing test data obtained using pull-out specimens in steady conditions might not be conservative under realistic boundaries and loading. This result underlines the need to modify the experimental approach, in order to be able to realistically predict the performance of steel-to-concrete bond. In order to validate the thermo-mechanical numerical model employed in the previous numerical work, the tests were also numerically simulated. The results of the numerical analysis were found to be in good agreement with the experimental results.

Journal

Materials and StructuresSpringer Journals

Published: Jan 13, 2018

References

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