Experimental Investigation on Fire Behavior and Quantitative Restraint Forces of Steel–Concrete Composite Floor Systems
Publication: Journal of Structural Engineering
Volume 148, Issue 10
Abstract
A special testing apparatus was designed and employed to explore the fire behavior of a steel–concrete composite floor system with boundary restraints and to measure the variation in the restraint forces induced by fire. Two full-scale fire tests of slab specimens with different secondary support conditions were conducted. Detailed experimental results were obtained, including the furnace temperature, temperature distribution, vertical and horizontal deflection, crack patterns, and restraint forces. The furnace was shut off after 270 and 300 min when the insulation criterion for failure was met. Although the two composite floor systems were exposed to lengthy fire durations, they exhibited better fire resistance than the isolated composite slabs evaluated in previous tests in terms of aspects such as relatively limited deflection, higher deflection recovery, and excellent concrete slab integrity. The restraint moment at the slab corners was determined by the measured internal forces of steel beams in the steel frame using mechanical analysis of the relevant spatial structures. Significant warping forces were observed at the slab corners during the tests. This implied that the warping force posed a potential hazard to the adjacent columns above the composite floor system subjected to fire.
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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
The authors acknowledge the support of the National Natural Science Foundation of China (Grant Nos. 51778250 and 51308233) and the Natural Science Foundation of Fujian Province (Grant No. 2019J01051).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 148 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 6, 2022
Accepted: Apr 8, 2022
Published online: Jul 29, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 29, 2022
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