Elimination of Debonging of FRP Strips in Shear Strengthened Beams Using Grooving Method

Abstract:

Article Preview

One of the methods of retrofitting reinforced concrete structures is use of FRP sheets to increase the flexural and shear strength of concrete elements. Use of FRP materials is in rapid progress because of their high strength, light weight and easy installation of FRP composites. Poisson’s ratio mismatch between FRP sheets and concrete is resulted premature debonding of FRP strips. Hence, the use of ultimate strength of FRP sheets is difficult if EB (External bonded) is applied in installation of FRP. Therefore, debonding has been repeatedly reported in most experimental studies. Recent studies in Isfahan University of Technology (IUT) show that use of grooving method (GM) to attach the FRP sheet to concrete surface for flexural strengthening is much more effective compared to conventional methods. In present experimental study, small scale reinforced concrete beams were strengthened with FRP strips for shear. Comparison between the ultimate load and deflection of the test beams demonstrates that grooving method was effective and led to elimination of debonding of FRP strips used for shear strengthening.

Info:

Periodical:

Advanced Materials Research (Volumes 250-253)

Edited by:

Guangfan Li, Yong Huang and Chaohe Chen

Pages:

1077-1081

DOI:

10.4028/www.scientific.net/AMR.250-253.1077

Citation:

D. Mostofinejad and A. Tabatabaei Kashani, "Elimination of Debonging of FRP Strips in Shear Strengthened Beams Using Grooving Method", Advanced Materials Research, Vols. 250-253, pp. 1077-1081, 2011

Online since:

May 2011

Export:

Price:

$35.00

[1] ACI 440R, State-of-the-art report on fiber reinforced plastic reinforcement for concrete structures, American Concrete Institute Committee 440 (2004).

[2] H. Toutanji, G. Ortez, The effect of surface preparation on bond interface between sheets and concrete members, Composite structures 53 (2001) 457-462.

DOI: 10.1016/s0263-8223(01)00057-5

[3] L. De Lorenzis, J.G. Teng, Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures, Composites part B 38 (2007) 119-143.

DOI: 10.1016/j.compositesb.2006.08.003

[4] A. Rizzo, L. De Lorenzis, Behavior and capacity of RC beams strengthened in shear with NSM FRP reinforcement, Construction and Building Materials 23 (2009) 1555-1567.

DOI: 10.1016/j.conbuildmat.2007.08.014

[5] D. Mostofinejad, E. Mahmoudabadi, Grooving as an Alternative of Surface Preparation to Postpone Debonding of FRP Lamination in Concrete Beams, Journal of Composites for Construction 14 6 (2010) 804-811.

DOI: 10.1061/(asce)cc.1943-5614.0000117

[6] L. C Hollaway, M. B. Leeming, Strengthining of reinforced concrete structures, CRC Press, USA, (2000).

[7] E. Mahmoudabadi, D. Mostofinejad, An Alternative Method to Surface Preparation to Postpone Debonding of FRP Laminates, 9th International Symposium of Fiber Reinforced Polymer Reinforcement for Concrete Structures, Sydney, Australia (2009).

DOI: 10.1201/9780203864005.ch61

In order to see related information, you need to Login.