Bond Anchorage of Pretensioned FRP Tendon at Force Release
Publication: Journal of Structural Engineering
Volume 118, Issue 10
Abstract
The anchorage of fiber‐reinforced plastic (FRP) tendons in pretensioned prestressed concrete (PC) members may cause the formation of cracks as a result of tendon wedge effect and mechanical interlocking during prestress force transfer. This paper presents experimental results obtained with a braided epoxy‐impregnated aramid FRP tendon having a 16‐mm nominal diameter and initial prestress force of 125.6 kN. Minimum concrete cover was 52 mm. End‐zone reinforcement and tendon partial blanketing were used to determine their effect on concrete stress field intensity and on cracking due to prestress force transfer. It was found that steel stirrups do not prevent cracking, but they limit its propagation. A carbon FRP coil of small pitch inhibits crack formation, but the concrete tensile strain remains high. Partial blanketing is the most effective solution, causing only a limited increase in transfer length (approximately 20%). An analytical solution to the experiment was obtained by using the finite element method, assuming a partly cracked elastic concrete ring model. This proved to be an effective tool for predicting the occurrence of cracks when using tendons of different size and/or initial prestress force.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Collins, M. P., and Mitchell, D. (1987). Prestressed concrete basics. Canadian PCI, Ottawa, Canada.
2.
Gergely, P., and Sozen, M. A. (1967). “Design of anchorage‐zone reinforcement in prestressed concrete beams.” PCI J., 12(2), 63–75.
3.
Gerritse, A., (1990). “Applications and design criteria for aramid fibrous tensile elements.” Proc., Composite Materials in Buildings, CNR, Milan, Italy, 317–333.
4.
Hasuo, K., Okamoto, T., and Tanigaki, M. (1991). “Study on braided aramid fiber rods (Part 14. Tensile properties and their distribution).” Proc., Arch. Inst. Japan, Tokyo, Japan (in Japanese).
5.
Iyer, S. L., and Sen, R., eds. (1991). Advanced composites materials in civil engineering structures. ASCE, New York, N.Y.
6.
Leonhardt, F. (1964). Prestressed concrete: Design and construction. 2d Ed., W. Ernst & Sohn, Berlin, Germany.
7.
Nanni, A., Utsunomiya, T., Yonekura, H., and Tanigaki, M. (1991). “Transfer length of braided aramid fiber tendons.” Proc., Japan Concr. Inst., Tokyo, Japan, 13(1), 963–968.
8.
Okamoto, T., Matsubara, S., and Tanigaki, M. (1988). “Characteristics of braided aramid fiber rods.” Proc., Japan Concr. Inst., Tokyo, Japan, 10(2), 659–664 (in Japanese).
9.
Stone, W. C., and Bren, J. E. (1984). “Behavior of postensioned girder anchorage zones.” PCI J., 29(1), 64–109.
10.
Tanigaki, M., Okamoto, T., Tamura, T., Matsubara, S., and Namura, S. (1988). “Study on braided aramid fiber rods for reinforced concrete.” Proc., 13th IABSE‐AIPC‐IVBH Congress, Helsinki, Finland, 15–20.
11.
Tanigaki, M., Nomura, S., Okamoto, T., and Endo, K. (1989). “Flexural behaviors of partially prestressed concrete beams reinforced with braided aramid fiber rods.” Trans. Japan Concr. Inst., 11, 215–222.
12.
Tepfers, R. (1979). “Cracking of concrete cover along anchored deformed reinforcing bars.” Mag. Concr. Res., 31(106), 3–13.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 118 • Issue 10 • October 1992
Pages: 2837 - 2854
Copyright
Copyright © 1992 ASCE.
History
Published online: Oct 1, 1992
Published in print: Oct 1992
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.