Effects of Biaxial Bending and Axial Restraint on Hybrid Fiber Reinforced High-Performance Concrete Columns at Elevated Temperatures
Publication: Journal of Structural Engineering
Volume 148, Issue 11
Abstract
The presence of axial restraint and biaxial load eccentricity plays a vital role in the behavior and design of columns under fire conditions. Because there is limited research on these two parameters, an experimental study on hybrid fiber reinforced high-performance concrete (HPC) columns subject to standard fire curve is performed to explore the effect of biaxial bending and axial restraint. A total of four full-scale HPC columns are tested to explore the structural and spalling behavior at elevated temperatures. Test results including thermal and structural responses are elaborated, and temperature distribution, structural deformation, thermally induced restraint force, crack pattern, and fire endurance are analyzed and discussed. Explosive spalling does not occur in all the columns even under biaxial load eccentricity and axial restraint, which is attributed to the presence of steel and polypropylene fibers. It is shown that thermally induced restraint force accelerates the deformations of restrained columns. Consequently, the fire endurance of restrained columns is reduced compared with unrestrained columns. Besides, a numerical model to trace the development of axial deformation and restraint force is proposed. The proposed model is validated with test results with respect to temperature profiles, axial deformation, and restraint force. It shows that the proposed model has reasonable 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
This material is based on research/work supported by the Singapore Ministry of National Development and National Research Foundation under L2 NIC Award No. L2NICCFP1-2013-4. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of L2 NIC.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 148 • Issue 11 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 10, 2022
Accepted: Jun 14, 2022
Published online: Sep 9, 2022
Published in print: Nov 1, 2022
Discussion open until: Feb 9, 2023
ASCE Technical Topics:
- Axial loads
- Bending (structural)
- Biaxial loads
- Concrete
- Continuum mechanics
- Deformation (mechanics)
- Disaster risk management
- Disasters and hazards
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fiber reinforced concrete
- Fires
- High-performance concrete
- Man-made disasters
- Materials engineering
- Measurement (by type)
- Solid mechanics
- Static loads
- Statics (mechanics)
- Structural dynamics
- Structural mechanics
- Temperature effects
- Temperature measurement
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