Experimental and Numerical Study of Fire Endurance of Bonded Posttensioned Concrete Slabs
Publication: Journal of Structural Engineering
Volume 149, Issue 12
Abstract
The vulnerability of posttensioned (PT) slabs to fire has prompted researchers to conduct tests and devise means for numerical analysis. In this study, bonded PT slabs with varying cover thicknesses were subjected to fire tests with a numerical model developed based on the results. The test results demonstrate that current codes governing cover thickness adequately address fire resistance. The structural behavior of PT slabs was analyzed based on thermal responses for concrete and steel. Numerical modeling of heat transfer and coupled thermomechanical analyses was validated by comparison with fire test results. To investigate the influence of cover thickness on fire resistance performance, a parametric study to develop a numerical means of analysis was conducted and evaluated. With a load level of up to 40% of nominal flexural capacity at the specified cover thickness of 45 mm or larger, current codes were proven to be adequate to ensure the target safety. The authors hope that identified influencing factors of fire resistance performance of PT slabs and the proposed numerical modeling method may be helpful in design of bonded PT concrete slabs with unrestrained conditions.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Research Foundation of Korea (2021R1A5A1032433). The authors express their gratitude and appreciation for the partial support provided by the Institute of Construction and Environmental Engineering at Seoul National University.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 12 • December 2023
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.
History
Received: Jan 10, 2023
Accepted: May 15, 2023
Published online: Oct 12, 2023
Published in print: Dec 1, 2023
Discussion open until: Mar 12, 2024
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