Fatigue Behavior of UHPC Beams Prestressed with External CFRP Tendons
Publication: Journal of Composites for Construction
Volume 26, Issue 5
Abstract
This paper presents an experimental investigation of the fatigue behavior of ultrahigh-performance concrete (UHPC) beams prestressed with external carbon fiber-reinforced polymer (CFRP) tendons. Seven T-shaped beams were tested, and the effects of the effective prestressing stress, partial prestressing ratio, and fatigue load level on the flexural behavior and stiffness were analyzed and presented. Overall, the CFRP tendon–anchor assembly exhibited excellent fatigue performance. All tested fully prestressed beams survived 2 million cycles in fatigue tests, and the variation in their flexural capacity was limited. The partially prestressed beam failed after approximately 97,200 cycles due to fatigue fracture of the internal reinforcement. After fracture of the tensile steel bars, the partially prestressed beam behaved similarly to the fully prestressed beam and sustained more than half of the flexural capacity after 2 million cycles. A higher effective prestressing stress was favorable for maintaining the stiffness of CFRP prestressed UHPC beams.
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Acknowledgments
The research described herein was sponsored by the National Natural Science Foundation of China (Project ID 51938012). The authors also acknowledge the colleagues in the Key Laboratory of Wind and Bridge Engineering of Hunan Province at Hunan University for their technical support.
Notation
The following symbols are used in this paper:
- Ap
- area of the CFRP tendon;
- As
- area of tensile steel bars;
- Bf
- stiffness after a number of fatigue cycles;
- Bs
- stiffness before fatigue test;
- d
- nominal diameter of a wire of CFRP tendons;
- D
- nominal diameter of CFRP tendons;
- de
- effective diameter of a wire of CFRP tendons;
- Ec
- elasticity modulus of UHPC;
- fc
- axial compressive strength of UHPC;
- fcu
- cubic compressive strength of UHPC;
- ffp
- tensile strength of the CFRP tendon;
- fpe
- effective prestressing stress in the CFRP tendon;
- fy
- yield strength of the tensile steel bar;
- N
- loading cycles of beams;
- Nf
- fatigue life of beams;
- Pcr
- cracking load of beams under static loading;
- Pmax
- upper limit of fatigue load;
- Pmin
- lower limit of fatigue load;
- Ps
- softening load of fully prestressed beams under static loading;
- Pu
- ultimate load of beams under static loading;
- Pu,pf
- ultimate load of beams in the postfatigue static test;
- Py
- yielding load deflection of partially prestressed beams under static loading;
- R
- fatigue load range;
- Rf
- fatigue load level;
- Δcr
- cracking midspan deflection of beams under static loading;
- Δfatigue
- midspan deflection of beams under the upper limit of fatigue load after a number of fatigue cycles;
- Δs
- softening midspan deflection of fully prestressed beams under static loading;
- Δstatic
- midspan deflection under the upper limit before the fatigue test;
- Δu
- ultimate midspan deflection of beams under static loading;
- Δu,pf
- ultimate midspan deflection of beams in the postfatigue static test;
- Δy
- yielding midspan deflection of partially prestressed beams under static loading;
- Δσs
- stress range in tensile steel bars;
- θ
- stiffness reduction coefficient of the beams;
- ρs
- longitudinal reinforcement ratio;
- ρsv
- shear reinforcement ratio;
- σs,max
- maximum stress in the tensile steel bars; and
- σs,min
- minimum stress in the tensile steel bars.
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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: Nov 12, 2021
Accepted: Jun 13, 2022
Published online: Aug 10, 2022
Published in print: Oct 1, 2022
Discussion open until: Jan 10, 2023
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- Jiaping Fu, Tian Zeng, Bing Wang, Ping Zhuge, Jiajun Xia, Wanyun Cai, The Interfacial Friction Loss of Prestressed Carbon-Fiber Tendons in a Bending State, Buildings, 10.3390/buildings13010099, 13, 1, (99), (2022).