Impact Loading of Concrete Beams Externally Strengthened with CFRP Laminates
Publication: Journal of Composites for Construction
Volume 3, Issue 3
Abstract
The quasi-static behavior of flexural members strengthened with carbon fiber reinforced polymer (CFRP) laminates has been well documented in recent years, but there is a gap in knowledge regarding the effects of dynamic and impact loading of such members. This paper presents the test results of four 8 m beams externally strengthened for flexure, two with CFRP laminates and two with steel plates. Impact loading was induced by lifting one end of the simply supported beams and dropping it from given heights. The strain rates induced in the CFRP laminates were at least three orders of magnitude greater than the strain rates used for testing CFRP laminate coupons in tension. Comparisons are made between the dynamic impact behavior of the beams strengthened with CFRP laminates and steel plates, and the behavior of both beam types is modeled using an equation of motion. The beams externally strengthened with CFRP laminates performed well under impact loading, although they could not provide the same energy absorption as the beams externally strengthened with steel plates. Additional anchoring, at least at the ends of the CFRP laminates, would improve the impact resistance of these beams. Good predictions were made with the derived equation of motion by using the flexural stiffness of the beams at their ultimate limit state.
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References
1.
Ammann, W. (1983). “Zur Anwendbarkeit der dynamischen Plastizitätstheories auf impulsbelastete Stahlbetonstrukturen.” VDI Berichte 496, Verein Deutscher Ingenieure, Zürich, 49–56 (in German).
2.
Ammann, W., Mühlematter, M., and Bachmann, H. (1982). “Versuche an Stahlbeton- und Spannbetonbalken unter stossartiger Beanspruchung. Teil 2. Konzeption und Durch-ührung der Balkenversuche.” Zusammenfassung der Versuchsresultate, Rep. 7709-2, Institute für Baustatik und Konstruktion der Eidgenössische Technische Hochschule, Zürich (in German).
3.
Deuring, M. (1994). “Fallversuche an nachträglich mit CFK-Lamellen verstärkten Stahlbetonträgern.” Rep. No. 149,316, Swiss Federal Laboratories for Materials Testing and Research, EMPA, Dübendorf, Switzerland (in German).
4.
Fu, H. C., Erki, M. A., and Seckin, M. (1991). “A review of the effects of loading rate on concrete in compression.”J. Struct. Engrg., ASCE, 117(12), 3660–3679.
5.
Isenberg, J., et al. ( 1997). “Chapter 4: Dynamic fracture.” Fracture Mechanics of Concrete, Concepts, Models, and Determination of Material Properties, R8860. Draft, ACI Committee 446 Subcommittee on Dynamic Fracture, American Concrete Institute, Detroit.
6.
Krauthammer, T. (1998). “Blast mitigation technologies: Developments and numerical considerations for behavior assessment and design.” Keynote Address: Struct. under Shock and Impact V, Computational Mechanics Publications, Southampton, U.K., 3–12.
7.
Meier, U., Deuring M., Meier, H., and Schwegler, G. ( 1992). “Strengthening of structures with CFRP laminates: Research and applications in Switzerland.” Advanced Composite Materials in Bridges and Structures. Canadian Society for Civil Engineering, Montréal, 243–251.
8.
Meier, U., and Winistörfer, A. (1995). “Retrofitting of structures through external bonding of CFRP sheets.” Non-metallic (FRP) reinforcement for concrete structures. Proc., 2nd Int. RILEM Symp. (FRPRCS-2), E & FN Spon, London, 465–472.
9.
“Methods of test for concrete.” (1994). CSA-A23.2-94. Canadian Standards Association, Rexdale, Ont., Canada.
10.
Nanni, A. (1995). “Concrete repair with externally bonded FRP reinforcement: Examples from Japan.” Concrete International, June, 23.
11.
Steiner, W. ( 1996). “Strengthening of structures with CFRP strips.” Advanced Composite Materials in Bridges and Structures. Canadian Society for Civil Engineering, Montréal, 407–419.
12.
“Test method for tensile properties of continuous fiber reinforcing materials.” (1995). JSCE-E531, Japan Society of Civil Engineers, Tokyo.
13.
Weder, C., and Ladner, M. (1981). “Application of epoxy adhesives in the field of bonded externally reinforced concrete structures.” Colloquium on Effective Use of Mat. in Struct., International Association for Bridge and Structural Engineering British National Group, Imperial College, London, 123–135.
14.
White, T., Soudki, K., and Erki, M. A. (1998). “Loading rate effects on reinforced concrete beams strengthened with carbon-fibre reinforced polymer laminates.” Proc., Can. Soc. for Civ. Engrg., Annu. Conf., Canadian Society for Civil Engineering, Montréal, 633–642.
Information & Authors
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Published In
Journal of Composites for Construction
Volume 3 • Issue 3 • August 1999
Pages: 117 - 124
History
Received: Aug 6, 1998
Published online: Aug 1, 1999
Published in print: Aug 1999
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