Impact Response and Capacity of Precast Concrete Segmental versus Monolithic Bridge Columns
Publication: Journal of Bridge Engineering
Volume 24, Issue 6
Abstract
In this study, the performance of precast concrete segmental bridge columns (PCSBCs) against truck impacts was numerically investigated and compared with a corresponding conventional monolithic column (CMC). The numerical results have shown that although the impact force time histories of the two columns were quite similar under the same loading conditions, the PCSBC showed a better performance in terms of the induced bending moment and shear force by high impact force due to shear slippage and joint rocking between concrete segments. Also, the damage and failure of PCSBCs were localized at the two bottommost segments due to compression damage and/or combined flexural and shear failure of the concrete segment, whereas failure of the CMC distributed widely with flexural cracks, shear cracks, and punching shear at multiple sections. Furthermore, the base segment, which was found to absorb about 80% of the total absorbed energy of the PCSBC, played a crucial role in controlling the failure of the PCSBC. An analytical method to estimate the bending moment required to open the segment joint and the ultimate bending moment was also developed with consideration of the dynamic increase factor and the increase in axial force associated with stress wave propagation in the column induced by impact load.
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Acknowledgments
The authors are grateful for the financial support by the Australian Research Council (ARC). The first author expresses his gratitude to the Curtin University of Technology for the full Ph.D. scholarship.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 6 • June 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jan 22, 2018
Accepted: Dec 18, 2018
Published online: Apr 10, 2019
Published in print: Jun 1, 2019
Discussion open until: Sep 10, 2019
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