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.
Materials and Structures – Springer Journals
Published: Jan 13, 2018
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