Collapse Resistance of Reinforced Concrete Frame Beams under Sustained Loads
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Structural Engineering
Volume 149, Issue 7
Abstract
Following column failure in a reinforced concrete (RC) frame, the beams supported initially by the failed column need to successfully carry the redistributed gravity loads to prevent a progressive collapse. These gravity loads will continuously act on the damaged structure after the column loss. However, it is unknown how the load sustainment would impact the collapse resistance of the beams. This research aimed to experimentally characterize the time-dependent response of axially restrained RC frame beams under compressive arch action, which has been identified from the past short-term loading tests as an important load-carrying mechanism. Five two-span beam-column subassemblies were constructed at a -scale for cross sections and tested after 267 to 480 days of concrete casting. Major test variables included sustained load level and beam span-to-depth ratio. Two specimens had a span-to-depth ratio of 10.6 and the remaining three had a ratio of 7.5. Four high sustained load levels were considered: 80%, 90%, 95%, and 100% of the predicted short-term loading capacity. To explore the effects of previous sustained loading on beam behavior during the subsequent sustained loading, two specimens were tested with two increasing levels of sustained load. Two specimens failed after carrying the sustained loads for 3 and 65 min. For other specimens, the sustained loads were applied for 10 to 50 days, depending on the observed deflection rate. The tests suggested that the sustained loading capacity of aged RC frame beams with a span-to-depth ratio of 10.6 and 7.5 can be taken as 90% and 95% of the short-term loading capacity under compressive arch action and the reduced global long-term loading capacity was affected by beam slenderness. However, neither the sustained load level nor duration negatively affected the flexural strength of the critical sections. Moreover, the evolution of Poisson’s ratio of concrete cover indicated the likelihood of creep failure due to the sustained loads.
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Data Availability Statement
Experimental data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This paper is based on work supported by the National Science Foundation under Grant Nos. 1762362 and 1760915. The authors gratefully acknowledge the financial support from the National Science Foundation. The opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsor.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 10, 2022
Accepted: Mar 22, 2023
Published online: May 10, 2023
Published in print: Jul 1, 2023
Discussion open until: Oct 10, 2023
ASCE Technical Topics:
- Beams
- Concrete
- Concrete beams
- Concrete frames
- Design (by type)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Failure loads
- Foundation design
- Foundations
- Frames
- Geotechnical engineering
- Gravity loads
- Load bearing capacity
- Load factors
- Load tests
- Materials engineering
- Reinforced concrete
- Static loads
- Statics (mechanics)
- Structural design
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
Authors
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