Bond–Slip Models for Corroded RC Members Exposed to Fire
Publication: Journal of Structural Engineering
Volume 148, Issue 3
Abstract
This paper presents the latest research findings investigating RC members’ residual load–slip response to combined damage caused by corrosion and fire. The idea is to simulate an accidental fire in old or aging structures situated in an aggressive environment such as along the coastlines. The research involved evaluating the response of an RC bond exposed to corrosion and subsequently to elevated temperatures. Pullout bond tests were carried out on cylindrical bond specimens as per standard recommendations following the exposure to accelerated corrosion and elevated temperatures at steady state. Specimens were corroded in the range (2%–20%) as mass loss followed by exposure to elevated temperatures to achieve the steady state (200°C–800°C). The residual load–slip response is examined with the aid of displacement-controlled pullout tests. A set of LVDTs equipment was used to precisely obtain the ultimate bond strength and the steel bar’s slip relative to the concrete. The study presents distinct load–slip response curves depicting the overall load–slip mechanism of an RC bond. The results indicate significant changes in the load–slip response due to the two nonlinear phenomena’s superimposition. The bond strength degradation and the load–slip response have been modeled to predict RC members’ bond behavior exposed to corrosion–temperature interaction.
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Data Availability Statement
We confirm that all the data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research was funded by IIT Roorkee, (MHRD) Ministry of Human Resources and Development, University Grants Commission (UGC), Government of India.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 3 • March 2022
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© 2021 American Society of Civil Engineers.
History
Received: Jul 7, 2020
Accepted: May 24, 2021
Published online: Dec 16, 2021
Published in print: Mar 1, 2022
Discussion open until: May 16, 2022
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