Laboratory Tests of RC Beams Strengthened Against Flexure and Shear by the Use of SRP Overlays

Abstract:

Mechanical properties of the laminates reinforced with steel wires based on UHTS (Ultra High Tensile Strength) steel are only slightly worse than popular carbon strips. Thanks to competitive price they become popular strengthening material for concrete structures. The paper presents the results of laboratory tests of beams not efficiently reinforced in shear zone and strengthened along its side surfaces by the L-type overlays made of SRP tape. In addition, in order to ensure a high load-bearing capacity, beams were strengthened against bending. The effectiveness of reinforcement in a comparative test of unreinforced model was analyzed including ultimate capacity, deflection, failure model and strains. The results were used to evaluate the efficiency of SRP shear strengthening.

• Periodical: Applied Mechanics and Materials (Volume 837)
• Pages: 22-27
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.837.22
• Online since: June 2016
• Authors: Rafal Krzywon*
• Keywords: FRP Strengthening, Steel Reinforced Polymers, Ultra-High Tensile Strength Steel

References

[1] G.J. Mitolidis, T.N. Salonikios, A.J. Kappos, Test results and strength estimation of R/C beams strengthened against flexural or shear failure by the use of SRP and CFRP, Composites: Part B 43 (2012) 1117-1129.

DOI: 10.1016/j.compositesb.2011.11.034

[2] E. Wobbe, P. Silva, B. Barton, L. Dharani, V. Birman, A. Nanni, T. Alkhrdaji, J. Thomas, T. Tunis, Flexural capacity of RC beams externally bonded with SRP and SRG, in: Proceedings of SAMPE symposium, Long Beach, California, USA, (2004).

DOI: 10.1016/j.msea.2005.08.151

[3] F. Ceroni, M. Pecce, A. Prota, G. Manfredi, Flexural Strengthening of RC Beams using Emerging Materials: Cracking Behavior, in: Proceedings of FRP Composites in Civil Engineering – CICE 2004, Adelaide, Australia, (2004).

DOI: 10.1201/9780203970850.ch16

[4] X. Huang, V. Birman, A. Nanni, G. Tunis, Properties and potential for application of steel reinforced polymer (SRP) and steel reinforced grout (SRG) composites. Composites: Part B 36 (2005) 73–82.

DOI: 10.1016/s1359-8368(03)00080-5

[5] A. Prota, K.Y. Tan, A. Nanni, M. Pecee, G. Manfredi, Performance of Shallow Reinforced Concrete Beams with Externally Bonded Steel-Reinforced Polymer, ACI Structural Journal (2006) 163-170.

DOI: 10.14359/15173

[6] N. Saber, T. Hassan, A.S. Abdel-Fayad, H. Gith, Flexural behavior of concrete beams strengthened with steel reinforced polymers, in: 4th Int. Conf. on FRP Composites in Civil Engineering, CICE 2008, EMPA-Akademie Publications, Zurich, Switzerland, (2008).

[7] A. Balsamo, F. Nardone, I. Iovinella, F. Ceroni, Flexural strengthening of concrete beams with EB-FRP, SRP and SRCM, Experimental investigation, Composites: Part B 46 (2013) 91-101.

DOI: 10.1016/j.compositesb.2012.10.014

[8] A. Lopez, N. Galati, T. Alkhrdaji, A. Nanni, Strengthening of a reinforced concrete bridge with externally bonded steel reinforced polymer (SRP), Composites: Part B 38 (2007) 429–436.

DOI: 10.1016/j.compositesb.2006.09.003

[9] R. Krzywon, Properties of steel reinforced polymers in comparision with other fiber reinforced composites, Proceedings of 11th International Conference on New Trends in Statics and Dynamics of Buildings, 2013, Bratislava, Slovakia, pp.121-122.

[10] U. Meier, Strengthening of structures using carbon fibre/epoxy composites, Construction and Building Materials Vol. 9, No. 6 (1995).

DOI: 10.1016/0950-0618(95)00071-2