Lateral Behavior of Precast Segmental UHPC Bridge Columns Based on the Equivalent Plastic-Hinge Model
Publication: Journal of Bridge Engineering
Volume 24, Issue 3
Abstract
The concept of an equivalent plastic-hinge model was used to evaluate the lateral behavior of precast segmental ultra-high-performance concrete (UHPC) bridge columns. The columns consist of precast UHPC segments that were integrated by unbonded post-tensioning (PT) tendons and complemented with energy dissipation (ED) bars. The equivalent constitutive relationships of the PT tendons and the ED bars were analytically derived to meet the plane section assumption for the sectional analysis. Cyclic loading tests were conducted on three specimens to validate the proposed equivalent plastic-hinge model. The test results revealed that the proposed model showed good accuracy for predicting the lateral skeleton curve, stiffness, and opening at the base joint. Using the validated model, a parametric study was conducted to investigate the effects of nine main design parameters on the lateral behavior of the column. The parametric study showed that increasing the PT level is more economical to enhance the PT force than relying on the larger ratio of the PT tendons when the PT level is no more than 44% of the yield strength. Finally, a simplified formula for the effective stiffness was developed through regressive analysis. The effective stiffness depended on the aspect ratio, the number and unbonded length of ED bars, and axial loading ratio.
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Acknowledgments
The work described in this paper was financially supported by the National Natural Science Foundation of China (Grants 51378110, 51438003, and 51528802), Scientific Research Foundation of Graduate School of Southeast University (Grant YBPY1707), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (Grant CE02-1-4), and a project of the Science and Technology Research and Development Plan of China Railway Corporation (2017G006-C).
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 3 • March 2019
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Mar 13, 2018
Accepted: Jul 12, 2018
Published online: Dec 21, 2018
Published in print: Mar 1, 2019
Discussion open until: May 21, 2019
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