Robustness of Post-Tensioned Concrete Beam-Column Subassemblies under Various Column Removal Scenarios
Publication: Journal of Structural Engineering
Volume 148, Issue 5
Abstract
To fully recognize the load-resisting mechanisms of post-tensioned concrete (PC) structures with realistic boundary conditions against disproportionate collapse, four beam-column subassemblies were extracted from a prototype building and the side columns and joints were reproduced to reflect the actual boundary condition. The parametric analysis was conducted, including location of the removed column (middle or penultimate) and strand profile (straight or parabolic). In addition, two RC counterparts were tested as a control group. Test results indicate that the unbonded post-tensioning strand (UPS) was able to enhance the structural robustness by increasing compressive arch action capacity of RC beams and developing catenary action. Compared with RC specimens, both PC specimens achieved much higher load resistance; herein, the PC specimen with straight strand profile obtained the highest load resistance due to two strands used, while the PC specimen with parabolic profile had higher deformation capacity. However, the existence of UPS increased the tensile force demand to the side column, leading to the flexural tension failure of the side column when the loss of a penultimate column was considered. Finally, an analytical study was carried out to quantify the load resistance from each dominant load-resisting mechanism.
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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 research was supported by a research grant provided by the National Natural Science Foundation of China (Grant Nos. 52022024 and 51778153) and Guangxi Science and Technology Base and Special Fund for Talents Program (Grant No. Guike AD20159011). Any opinions, findings, and conclusions expressed in this paper are those of the writers and do not necessarily reflect the view of the Natural Science Foundation of China and Guangxi Science and Technology Base and Special Fund for Talents Program.
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Journal of Structural Engineering
Volume 148 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 22, 2021
Accepted: Dec 22, 2021
Published online: Feb 24, 2022
Published in print: May 1, 2022
Discussion open until: Jul 24, 2022
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