Fire Resistance of Composite Beams with Composite Slabs under Hinge Constraints
Publication: Journal of Structural Engineering
Volume 149, Issue 3
Abstract
To study the fire resistance of monolithic composite beams and separated composite beams with composite slabs under hinge constraints, constant-load temperature rise tests were conducted on a full-scale two-span continuous beam. The test phenomena, temperature distribution, displacement changes, and failure modes of the composite beam were studied during the entire process of the fire. The results showed that the cracking of the seams between the precast slabs of the separated composite slabs led to an increase in the burned area of the composite slabs and an increase in the temperature of the composite beams. No obvious cracking was observed at the postpouring seams of the monolithic composite slabs, the integrity and fire resistance of which were better. After the temperature stopped increasing, the steel beam cooled faster than the concrete composite slabs. The deformation recovery of the steel beam was restricted by the composite slabs, which were subject to the joint action of the constraining force generated by the deformation recovery of the steel beam and the external load, resulting in longitudinal cracks along the medial axis of the top of the slabs. The deformation recovery ratios of the two types of composite beams with composite slabs under hinged conditions after the temperature stopped increasing were similar. The calculation method of the axial force and horizontal displacement of the composite beam with composite slabs under the hinge constraint at the beam end in the fire was established, and the calculation results were in good agreement with the test results, with good calculation accuracy.
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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 research described here received financial support from the Key Program of National Natural Science Foundation of China (Project No. 52038006) and the General Program of National Natural Science Foundation of China (Project Nos. 51878398 and 52178490).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 3 • March 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 19, 2022
Accepted: Nov 7, 2022
Published online: Jan 5, 2023
Published in print: Mar 1, 2023
Discussion open until: Jun 5, 2023
ASCE Technical Topics:
- Beams
- Composite beams
- Construction engineering
- Construction methods
- Continuous beams
- Design (by type)
- Engineering fundamentals
- Fastening
- Fire resistance
- Hinges
- Load and resistance factor design
- Load factors
- Measurement (by type)
- Slabs
- Steel beams
- Structural design
- Structural engineering
- Structural members
- Structural systems
- Temperature effects
- Temperature measurement
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