Experimental and Numerical Study on Axial Capacity of FRP-Rehabilitated Postblast RC Bridge Pier
Publication: Journal of Bridge Engineering
Volume 28, Issue 10
Abstract
The aim in this study is to experimentally and numerically evaluate the effectiveness of the fiber-reinforced polymer (FRP) rehabilitation technique on postblast piers. Firstly, contact explosion, carbon FRP (CFRP) rehabilitation, and axial compression tests were successively conducted on half-scale RC pier specimens. The incident overpressure time histories and damage profiles of specimens in the explosion test, as well as the axial force–displacement curves, strain time histories of FRP, and specimen damage modes in the axial compression test were recorded. Secondly, a finite-element (FE) analysis approach was proposed and experimentally validated to reproduce the blast wave–pier interactions and dynamic behaviors of RC piers under explosions, as well as the axial compressive performance of the intact, unrehabilitated, and FRP-rehabilitated RC piers. Furthermore, three typical explosion threats specified by the Federal Emergency Management Agency were selected, and the damage profiles and residual axial capacities of the seismically designed prototype bridge piers were further examined. An FRP rehabilitation scheme, covering FRP type, rehabilitation height, and number of rehabilitation layers, for restoring the axial capacities of postblast prototype piers is recommended. It indicates the following. (1) FRP rehabilitation effectively improves the axial capacity and ductility of postblast piers, but slightly affects the axial stiffness. (2) The residual axial capacities of the presented prototype piers reduced to 92% and 58% of the intact value under contact explosion from a suicide belt or suicide vest, and increased to 99% and 84% after two-layer CFRP rehabilitation. (3) Compared with glass FRP and aramid FRP, CFRP rehabilitation along the overall pier height is more strongly recommended. (4) Increasing the number of rehabilitation layers to four could prominently improve the axial capacity. This work could provide a supportive reference on the FRP rehabilitation of a RC bridge pier after explosions.
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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. The specific items are
1.
all the FE models and numerical simulation results, and
2.
all the original data shown in figures and tables.
Acknowledgments
The project was supported by the National Natural Science Foundations of China (52078379).
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Published In
Journal of Bridge Engineering
Volume 28 • Issue 10 • October 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 2, 2023
Accepted: Jun 6, 2023
Published online: Aug 10, 2023
Published in print: Oct 1, 2023
Discussion open until: Jan 10, 2024
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