Bond of GFRP Bars in Concrete: Experimental Study and Analytical Interpretation
Publication: Journal of Composites for Construction
Volume 10, Issue 5
Abstract
The local bond mechanics of glass-fiber reinforced polymer (GFRP) bars in normal strength concrete was investigated through experimental testing and analytical modeling. The experimental program was comprised of 30 direct tension pullout specimens with short anchorages. A novel test setup, specially designed so as to minimize the spurious influence of testing conditions on measured bond properties was adopted in the study. Parameters considered were the bar roughness and diameter, the size effect expressed by the constant cover to bar diameter ratio, and the external confining pressure exerted over the anchorage length by transverse externally bonded FRP sheets. Results of the study were summarized in the form of local bond-slip curves, whereby performance limit states were quantified by the amount of loaded end slip and bond strength. An analytical model of the bond stress-slip response of a GFRP bar was derived from first principles and calibrated against the test data of the present investigation. Using the calibrated model, design values for bond and slip were estimated with reference to the code limit state model for bond.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
Funding for this investigation was provided by the Hellenic General Secretariat for Research and Technology, Greece. Tests were conducted in the Laboratory of Reinforced Concrete, Department of Civil Engineering, Democritus University, Greece. The composite materials were generously donated by MAC BETON HELLAS S.A, SIKA Hellas and Concrete Protection Products Inc. Asl bars were purchased from Hughes Brothers Inc.
References
Achillides, Z., and Pilakoutas, K. (2004). “Bond behavior of fiber reinforced polymer bars under direct pullout conditions.” J. Compos. Constr., 8(2), 173–181.
American Concrete Institute (ACI). (2001). “Guide for the design and construction or concrete reinforced with FRP bars.” ACI 440.1R-01, ACI Committee 440, Farmington Hills, Mich.
Bakis, C., Uppuluri, V., Nanni, A., and Boothby, T. (1998). “Analysis of bonding mechanisms of smooth and lugged FRP rods embedded in concrete.” Compos. Sci. Technol., 58(8), 1307–1319.
Benmokrane, B., Tighiouart, B., and Chaallal, O. (1996). “Bond strength and load distribution of composite GFRP reinforcing bars in concrete.” ACI Mater. J., 93(3), 246–253.
Cairns, J., and Plizzari, G. A. (2002). “Do we need a standard test for bond?” Proc., Bond in Concrete—From Research to Standards, L. Balazs, J. M. Bartos, J. Cairns, and A. Borosnyoi, eds., fib (federation internationale du beton), Budapest, 259–267.
Cosenza, E., Manfredi, G., Pecce, M., and Realfonzo, R. (1999) “Bond between glass fiber reinforced plastic reinforcing bars and concrete—Experimental analysis.” Proc., 4th Int. Symp. of FRP Reinforcement for R.C. Structures (SP188), C. Dolan, S. Rizkalla, and A. Nanni, eds., ACI, 347–358.
FIB Bulletin 10 (FIB). (2000). “Bond of reinforcement in concrete.” Rep. by former CEB Task Group 2.5, Ch.7/TG 4.2/WP 7, International Federation for Concrete, Lausanne, Switzerland.
FIB Bulletin No. 14 (FIB). (2001). “Externally bonded FRP reinforcement for r. c. structures.” Rep. by Task Group 9.3/Ch.4, International Federation for Structural Concrete, Lausanne, Switzerland.
Filippou, F., Popov, E., and Bertero, V. (1983). “Modeling of r/c joints under cyclic excitations.” J. Struct. Eng., 109(11), 2666–2684.
Kostouli, V., and Tsionis, I. (1999). “SmartLab—Software of digital image processing for calculations of surface concrete strains.” Dipl. thesis, Dept. of Civil Engineering, Demokritus Univ., Xanthi, Greece.
Malvar, J. (1995). “Tensile and bond properties of GFRP reinforcing bars” ACI Mater. J., 92(3), 276–285.
Novidis, D., and Pantazopoulou, S. J. (2005). “Experimental study of short NSM—FRP bar anchorages.” Proc., 7th Int. Symp. on FRP Reinforcement for R.C. Structures (FRPRCS-7), ACI, Kansas City, Kan.
Tepfers, R., Hedlund, G., and Rosinski, B. (1998). “Pull-out and tensile reinforcement splice tests with GFRP bars.” Proc., 2nd Int. Conf. on Composites in Infrastructure, H. Saadatmanesh and M. R. Ehsani, eds., Tucson, Ariz.
Information & Authors
Information
Published In
Copyright
© 2006 ASCE.
History
Received: Sep 15, 2005
Accepted: Dec 16, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
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.