Static Shear Performance and Residual Axial Capacity of Rectangular RC Bridge Piers under Near-Ground Lateral Loads
Publication: Journal of Structural Engineering
Volume 147, Issue 12
Abstract
Reinforced concrete (RC) bridge piers of highway viaducts are exposed to the vehicular impact hazard with impact location usually close to the ground (i.e., bottom of the pier), thus resulting in dominant shear damage. Different simplified approaches for the assessment of RC bridge pier performance under impact loads are generally based on equivalent static models. One crucial element for these approaches is the determination of the static shear performances and residual axial capacity. Because of limited experimental results available under these conditions, six half-scale rectangular RC columns with different volumetric reinforcement ratios and axial compressive loads were tested under near-ground lateral loads with monotonic static conditions. Test results indicate a clear major diagonal crack at the bottom of RC columns with an inclination angle of approximately 30° below the point of application of the lateral load, and it eventually slips along the crack surface under axial loads followed by failure (i.e., loss of residual axial capacity). The increase in the volumetric reinforcement ratio significantly improves the shear deformation capacity and shear crack resistance with a slight increase in the shear capacity. The increase in the axial load can also slightly increase the shear capacity of the columns but is accompanied by a reduction in shear deformation capacity. Additionally, prediction performances of three commonly used shear capacity models for the case of RC columns under near-ground lateral loads are investigated. Finally, based on the test results, an existing residual axial capacity model is modified to improve its prediction performance.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. The specific items are as follows: (1) all of the original data indicated in the figures; and (2) all of the original photos provided in the paper.
Acknowledgments
The authors are grateful for the financial support provided by the National Natural Science Foundation of China (51608191) and Hunan Provincial Natural Science Foundation of China (2018JJ3186 and 2020JJ5177). The fourth author (C. Demartino) is acknowledging the Zhejiang University–University of Illinois at Urbana Champaign Institute (ZJUI) for the financial support given to the present research.
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© 2021 American Society of Civil Engineers.
History
Received: Nov 11, 2020
Accepted: Aug 9, 2021
Published online: Sep 30, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 28, 2022
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