Time-Dependent Behavior of Reinforced Concrete Columns Subjected to High Sustained Loads
Publication: Journal of Structural Engineering
Volume 148, Issue 10
Abstract
Several catastrophic progressive collapses of RC buildings, initiated by column failures, occurred in the past under sustained gravity loads long after the initial construction. To study the near-failure behavior of aged concrete columns under sustained high stresses and the effects of column transverse reinforcement on nonlinear creep, 13 columns were tested after 200 days of concrete casting. Test variables included sustained load level, age at loading, eccentricity ratio, and transverse reinforcement ratio. Two plain concrete and five RC columns were subjected to sustained concentric loads ranging from 76% to 110% of nominal short-time strength that neglected the confinement effects provided by transverse reinforcement. One plain concrete column, as a control specimen, was also tested under concentric loading to failure in a short time. Five RC columns were tested under sustained eccentric loading that initially caused the bending moment at the critical section to reach 77% to 100% of nominal flexural capacity. The aged columns showed high resistance to heavy sustained loads; however, one concentrically loaded and one eccentrically loaded column failed under the sustained loads. Higher column transverse reinforcement ratio decreased concrete creep during the early stage of concentric loading and increased flexural stiffness during sustained eccentric loading, thereby reducing the risk of failure due to second-order effects. Moreover, the tests indicated that Poisson’s ratio of the cover concrete at the extreme compressive fibers is a suitable indicator of high sustained load levels.
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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 (NSF) under Grant Nos. 1762362 and 1760915. The authors gratefully acknowledge the financial support from NSF. 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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Published In
Journal of Structural Engineering
Volume 148 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 24, 2021
Accepted: May 16, 2022
Published online: Aug 1, 2022
Published in print: Oct 1, 2022
Discussion open until: Jan 1, 2023
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