Fire-Resistance Mechanism and Residual Bearing Capacity of Prestressed Concrete Beams after Fire Exposure
Publication: Journal of Structural Engineering
Volume 147, Issue 8
Abstract
The fire resistance and residual bearing capacity of prestressed concrete (PC) beams after fire exposure are very important to the safety of engineering applications. This study performed experimental investigations and theoretical calculations of the fire resistance of PC T-beams subjected to a standard fire. Effects of fire exposure time, steel strand location, and prestress level on failure mode, ductility, residual bending capacity, and residual stiffness of PC T-beams were investigated. The bending working mechanism of PC T-beams after exposure to the standard fire was determined. With increased fire exposure time, the ductility and bending stiffness decreased significantly and the failure mode changed. However, because of catenary action, extra vertical force between the end support of specimens and steel strands increased the ultimate bending capacity of fire-damaged PC T-beams. Multilayer steel strands with high prestress could delay initial crack occurrence and increase residual bending capacity effectively. However, they have little influence on residual stiffness.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This work was supported by the National Key R&B Program of China under Grant No. 2017YFC0806100, the Science and Technology Plan of Guangdong Province No. 180917114960497, the Guangdong Provincial Natural Science Foundation of China under Grants Nos. 2018A030307030 and 2020A1515011196, and the Science and Technology Plan Project of Zhejiang Provincial Transportation Department, No. 202153.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 8 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 23, 2020
Accepted: Mar 11, 2021
Published online: May 19, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 19, 2021
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