The Specific Properties Research of RC Beams Multiple Strengthened with Near-Surface Mounted Carbon Fiber Reinforced Plastic Bar and Pre-Stressed Helical Rib Bar

Abstract:

Seven concrete beams were constructed with normal reinforcement bars. Grooves were opened on the concrete cover of the tensile region in the concrete beams using different combinations of carbon fiber reinforced plastic (CFRP) and pre-stressed helical rib bar (HRB), CFRP and HRB pre-stressed at different levels were inserted into the grooves and filled with resin. Flexural experimental results indicated that the limit bearing capacity, rigidity, and crack resistance of the beams were strengthened significantly with near-surface mounted two pre-stressed HRB and one CFRP (BF1P2) bar, or near-surface mounted one pre-stressed HRB and two CFRP (BF2P1) bars, in which HRB was pre-stressed at 30%, 45%, and 60% of its limit strength, respectively. Compared with an un-strengthened beam, the crack loads of the BF1P2 beams increased by 86.70% and 133.33%, the yield loads by 32.25% and 72.04%, and the limit bearing capacities by 72.73% and 90%. The crack loads of the BF2P1 beams increased by 50% and 133.33%, the yield loads by 50.54% and 136.56%, and the limit bearing capacities by 72.20% and 173.60%. The BF1P2 beams had better reinforcing results compared to those of the BF2P1 beams. The beam strengthened with HRB pre-stressed at 45% of its limit strength was the best concrete beam.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 3068-3073
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.3068
• Online since: October 2012
• Authors: Zhen Hua Ren, Xian Tao Zeng
• Keywords: Carbon Fiber Reinforced Polymer/Plastic (CFRP), Concrete Beam, Experiment, Multiple near-Surface Mounted, Pre-Stressed Helical Rib Bar, Strengthened

References

[1] De Lorenzis L. , Nanni A., 1998. Shear strengthening of reinforced concrete beams with NSM fiber-reinforced polymer rods. ACI Structural Journal, (1)60-68

DOI: 10.14359/10147

[2] Ding Yahong, 2009. Research on flexural behavior of reinforced concrete beams strengthened with pre-stressed near surface mounted tendons. [Doctor thesis]. Henan Polytechnic University (in Chinese)

DOI: 10.4028/www.scientific.net/amr.163-167.3537

[3] Garden H N et al, 1998. The Strengthening and Deformation Behavior of Reinforced Concrete Beams Upgrade Using Pre-stressed Composite Plates[J]．Materials and Structures, 31: 247-258

DOI: 10.1007/bf02480423

[4] Hogue T et al, 1999.Myriad convention center floor system reinforcement . Proceedings of the FRPRCS-4, 1145-1161

[5] Hakan Nordin, Bjorn Taljsten, 2006. Concrete beams strengthened with pre-stressed near surface mounted CFPR, Journal of Composites for Construction.,10(1):60-68

DOI: 10.1061/(asce)1090-0268(2006)10:1(60)

[6] J.R. Mekenna and M.A. Erki, 1994. Strengthening of reinforced concrete flexural members using externally applied steel plates and fiber composite sheets-a survey, Canada Journal of Civil Engineering, 21:16-24

DOI: 10.1139/l94-002

[7] Ren Zhenhua, 2009. The flexural experiment of RC beam strengthened with near-surface mounted carbon fiber reinforced plastic and pre-stressed helical rib rebar [Master thesis]. Henan Polytechnic University (in Chinese).

DOI: 10.4028/www.scientific.net/amm.204-208.3068

[8] Wight, R. G. et al, 1995. Post-strengthening concrete beams with pre-stressed FRP sheets. Proc, 2nd Int., Symp. Non-Metallic (CFRP) Reinforcement for Concrete Structure., L.Taerwe, ed., Genth, Belgium, 568-575

DOI: 10.1201/9781482271621-79

[9] Zeng Xiantao et al, 2006. Calculation on method for bending capacity of concrete beams strengthened with pre-stressed near surface mounted carbon fiber reinforced plastic bar [J]. Engineering Mechanics, 23(supplement 2): 112~116 (in Chinese)

DOI: 10.4028/www.scientific.net/amm.204-208.3068

[10] Zeng Xiantao et al, 2010. Experiment of bend performances of RC beams strengthened with near-surface mounted truss helical rib rebar[J].China Civil Engineering Journal, 43(1):64-69 (in Chinese)

DOI: 10.1049/cp.2011.1193