Lateral-Impact Behavior of Axially Preloaded RC Columns Strengthened with Large-Rupture-Strain FRP Wraps
Publication: Journal of Composites for Construction
Volume 28, Issue 3
Abstract
Strengthening using large-rupture-strain fiber-reinforced polymer (LRS-FRP) laminates can effectively enhance the deformation and energy absorption capacity of reinforced concrete (RC) components under static and seismic loads. This study explores the application of LRS-FRP, particularly polyethylene terephthalate FRP (PET-FRP), to increase the impact resistance of RC columns in instances wherein high deformability and energy absorption capacity are necessary. Six RC column specimens, preloaded axially with heavy blocks and laterally impacted using a pendulum apparatus, were wrapped with PET-FRP. The dynamic responses of the columns, including the impact force, axial force, and lateral and axial displacements, were carefully recorded. Local strengthening schemes applied at the impact points of the columns and ends effectively enhanced their anti-impact performance without transferring damage to unstrengthened areas. As regards middle-impact specimens, PET-FRP wrapping changed the failure mode from shear to flexure failure, thereby increasing the lateral-impact resistance and deformation recovery capacity and preventing collapse owing to the axial bearing capacity loss. In bottom-impact specimens, PET-FRP improved ductility in the shear failure mode and maintained a consistent trend in the damage degree of flexure and shear failure columns across varying axial compressive ratios. Within an axial compression ratio of < 0.32, the axial force reduced flexural and shear damages. However, excessive axial preloading (axial compression ratio = 0.64) increased the flexural deformation because of the P-delta effect and shear damage owing to the increased risk of FRP debonding.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published paper.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant Nos. 52090084, 52178292, and 51808345).
Notation
The following symbols are used in this paper:
- E1
- initial elastic modulus;
- E2
- second-stage tangent modulus;
- H
- column height;
- hc
- section height;
- μ
- axial compression ratio; and
- δmax
- maximum deflection of the column.
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Published In
Journal of Composites for Construction
Volume 28 • Issue 3 • June 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 28, 2023
Accepted: Jan 8, 2024
Published online: Mar 28, 2024
Published in print: Jun 1, 2024
Discussion open until: Aug 28, 2024
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