Postfire Strength of Channel-Type Shear Connectors
Publication: Journal of Structural Engineering
Volume 149, Issue 10
Abstract
The combined action of steel and concrete in composite beams is accomplished via shear connectors that prevent slip between the two materials. In a fire event, the performance of these shear connectors may be impacted, hence affecting the strength of composite beams during and after a fire. This paper investigates the residual strength of channel-type shear connectors exposed to elevated temperatures. Twenty-two push-out specimens were fabricated with normal-weight and lightweight concrete and channel heights of 60, 80, and 100 mm. The specimens were tested without any heat exposure or after experiencing maximum temperatures of 400, 600, or 750°C. Results showed that temperatures up to 400°C did not cause a noticeable change in the residual strength of shear connectors, but on average, normal-weight concrete specimens exposed to 600°C and 750°C showed 17 and 31 percent decrease in their residual strength, respectively. Relatively similar strength reduction was observed in lightweight concrete specimens. Equations used in AISC 360-22 and CSA-S16-19 specifications provided reasonably accurate estimates of the capacity of unheated specimens but were excessively conservative for heat-exposed specimens. Finite-element models of the specimens were developed and validated based on the measured load-slip behavior of the specimens in preheating and postheating conditions.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge partial funding from Babol Noshirvani University of Technology through internal Grants BNUT/396026/00 and BNUT/984119090/00. Thanks are also due to Istaman Mehr Tabarestan, Co. and Leca Iran, Co. for donating the aggregates used in this research and Pelta Construction, Co. for assisting with the fabrication of the specimens.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 7, 2023
Accepted: May 17, 2023
Published online: Aug 11, 2023
Published in print: Oct 1, 2023
Discussion open until: Jan 11, 2024
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