Axial-Impact Resistance of CFRP-Confined Ultrahigh-Performance Concrete
Publication: Journal of Composites for Construction
Volume 26, Issue 5
Abstract
This study investigated the axial-impact resistance of unconfined and CFRP-confined UHPC. External confinement was provided by one to three plies of CFRP wraps with confinement ratios ranging from 0.126 to 0.378. A series of single- and multiple-impact tests was conducted using a Ø100 mm split Hopkinson pressure bar apparatus at mean strain rates ranging from 25 to 120 s−1. The dynamic behaviors of the specimens were examined and compared with those under quasi-static loading. The results indicate that the confinement of CFRP can significantly improve the axial-impact resistance of UHPC, exhibiting a strong strain-rate dependency. However, this sensitivity decreases with an increase in the confinement ratio. The dynamic failure modes of the CFRP-confined UHPC are different from those in the static tests, and the CFRP confinement ratio and impact energy determine the impact failure mode. Unlike in unconfined UHPC, a history of multiple impacts results in considerably lower accumulative damage in the confined UHPC. A new model was proposed to estimate the dynamic compressive strength of the CFRP-confined UHPC by considering the coupling effects of the confinement ratio and core concrete lateral inertia.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant Nos. 12072078 and 11627802) and the Science and Technology Planning Project of Guangdong Province (Project No. 2019B151502004).
Notation
The following symbols are used in this paper:
- As
- cross-sectional area of the specimen;
- At
- cross-sectional area of Hopkinson bar;
- C0
- propagation velocity of stress wave in the Hopkinson bar;
- D
- diameter of core concrete;
- Et
- elastic modulus of Hopkinson bar;
- fl
- nominal confining pressure;
- fco,s
- quasi-static strength;
- fcu,d
- dynamic strength;
- fFRP
- tensile strength of CFRP;
- Hs
- height of the specimen;
- tFRP
- thickness of CFRP;
- strain rate;
- ɛ
- strain;
- stress rate wave of the specimen;
- ɛs(t)
- strain wave of the specimen with time history;
- ɛi(t)
- incident strain wave;
- ɛr(t)
- reflected strain wave;
- ɛt(t)
- transmitted strain wave;
- ɛc
- ratio of the displacement recorded by the LVDTs;
- transition point for strain rate sensitivity;
- ρ
- density of Hopkinson bar;
- ρc
- ratio of nominal confining pressure to quasi-static strength;
- σ
- stress;
- σs(t)
- stress wave of the specimen; and
- ω
- toughness.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 5 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 21, 2022
Accepted: May 19, 2022
Published online: Jul 27, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 27, 2022
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