Flexure Behavior of Carbon Fiber Reinforced Polymers Retrofitted RC Beams

• Autorzy: Fahim Muhammad , Saeed Muhammad , Khan Haris , Gir Alam , Ullah Shahid

Identyfikatory

DOI

10.12913/22998624/147337

• Języki publikacji: EN

Abstrakty

EN

Carbon fiber reinforced polymers (CFRP) have been widely used for retrofitting of reinforced concrete members over the past three decades. This study presents the experimental results of four reinforced concrete beams retrofitted with CFRP and tested under four point monotonic loading. CFRP strips (Sika Carbo-Dur S812) and wraps (Sika-Wrap 230C) were used in two different patterns to evaluate their effect on the flexural behavior of RC beams. Two beams were first tested until their ultimate capacity, retrofitted with the application of CFRP and re-tested again, and two beams were retrofitted before the application of any load. The CFRP strips provided in the middle one-third of the span with U-shaped anchorage at the ends enhanced the capacity of beams up to 15 percent. The stiffness of the beams were significantly increased as demonstrated by smaller displacement at the ultimate load. However, the CFRP wraps provided without the anchorage didn’t enhance the strength due to pre-mature debonding.

Słowa kluczowe

EN

CFRP; retrofitting; strengthening; debonding; reinforced concrete structures

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2022
• Tom: Vol. 16, no 2
• Strony: 188--195
• Opis fizyczny: Bibliogr. 22 poz., fig., tab.

Twórcy

autor

Fahim Muhammad

• Department of Civil Engineering, University of Engineering and Technology, University Rd, Peshawar, Pakistan

• https://orcid.org/0000-0001-8955-5165

autor

Saeed Muhammad

• Student, Department of Civil Engineering, University of Engineering and Technology, University Rd, Peshawar, Pakistan

autor

Khan Haris

• Student, Department of Civil Engineering, University of Engineering and Technology, University Rd, Peshawar, Pakistan

autor

Gir Alam

• Student, Department of Civil Engineering, University of Engineering and Technology, University Rd, Peshawar, Pakistan

autor

Ullah Shahid

• Department of Civil Engineering, University of Engineering and Technology, University Rd, Peshawar, Pakistan

Bibliografia

• 1. Esfahani M.R., Kianoush M.R., Tajari A.R. Flexural behaviour of reinforced concrete beams strengthened by CFRP sheets. Engineering Structures. 2007; 29(10): 2428–2444.
• 2. Garden H.N., et al., An experimental study of the anchorage length of carbon fibre composite plates used to strengthen reinforced concrete beams. Construction and Building Materials. 1998; 12(4): 203–219.
• 3. Ashour A., El-Refaie S.A., Garrity S.W. Flexural strengthening of RC continuous beams using CFRP laminates. Cement and Concrete Composites. 2004; 26: 765–775.
• 4. Kalfat R., Al-Mahaidi R., Smith S.T. Anchorage Devices Used to Improve the Performance of Reinforced Concrete Beams Retrofitted with FRP Composites: State-of-the-Art Review. Journal of Composites for Construction. 2013; 17(1): 14–33.
• 5. Al-Amery R., Al-Mahaidi R. Coupled flexural–shear retrofitting of RC beams using CFRP straps. Composite Structures. 2006; 75(1): 457–464.
• 6. Deng J., Lee M.M.K. Effect of plate end and adhesive spew geometries on stresses in retrofitted beams bonded with a CFRP plate. Composites Part B: Engineering. 2008; 39(4): 731–739.
• 7. Pan J., Leung C.K. Effect of Concrete Composition on FRP/Concrete Bond Capacity. Journal of Composites for Construction. 2007; 11(6): 611–618.
• 8. Yao J., Teng J.G., Chen J.F. Experimental study on FRP-to-concrete bonded joints. Composites Part B: Engineering. 2005; 36(2): 99–113.
• 9. Seo S.-Y., Feo L., Hui D. Bond strength of near surface-mounted FRP plate for retrofit of concrete structures. Composite Structures. 2013; 95: 719–727.
• 10. Shin Y.-S., Lee C. Flexural behavior of reinforced concrete beams strengthened with carbon fiber-reinforced polymer laminates at different levels of sustaining load. Aci Structural Journal. 2004; 101(1): 137–138.
• 11. Kim Y.J., Green M.F., Wight R.G. Flexural behaviour of reinforced or prestressed concrete beams including strengthening with prestressed carbon fibre reinforced polymer sheets: application of a fracture mechanics approach. Canadian Journal of Civil Engineering. 2007; 34(5): 664–677.
• 12. Li H.M., Wu J., Wang Z. Shear Performance of Reinforced Concrete Beams with Corroded Stirrups Strengthened with Carbon Fiber Reinforced Polymer. Aci Structural Journal. 2016; 113(1): 51–61.
• 13. Bencardino F., et al. Shear behavior of reinforced concrete beams strengthened in flexure with bonded carbon fibre reinforced polymers laminates. Canadian Journal of Civil Engineering. 2005; 32(5): 812–824.
• 14. Jing M., Raongjant W., Li Z.X. Torsional strengthening of reinforced concrete box beams using carbon fiber reinforced polymer. Composite Structures. 2007; 78(2): 264–270.
• 15. Mohammadizadeh M., Fadaee M., Ronagh H. Improving Torsional Behaviour of Reinforced Concrete Beams Strengthened with Carbon Fibre Reinforced Polymer Composite. Iranian Polymer Journal (English Edition). 2009; 18.
• 16. Huo J.S., et al. Dynamic Behavior of Carbon Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Beams without Stirrups under Impact Loading. Aci Structural Journal. 2018; 115(3): 775–787.
• 17. Bakay R., Sayed-Ahmed E.Y., Shrive N.G. Interfacial debonding failure for reinforced concrete beams strengthened with carbon-fibre-reinforced polymer strips. Canadian Journal of Civil Engineering. 2009; 36(1): 103–121.
• 18. Choi D.U., et al. Flexural and Bond Behavior of Concrete Beams Strengthened with Hybrid Carbon-Glass Fiber-Reinforced Polymer Sheets. Aci Structural Journal. 2011; 108(1): 90–98.
• 19.Hughes B.P. Debonding of carbon-fibre-reinforced polymer plate from concrete beams. Proceedings of the Institution of Civil Engineers-Structures and Buildings. 2001; 146(3): 327–327.
• 20. Liu Y., et al. Debonding Detection of Reinforced Concrete (RC) Beam with Near-Surface Mounted (NSM) Pre-stressed Carbon Fiber Reinforced Polymer (CFRP) Plates Using Embedded Piezoceramic Smart Aggregates (SAs). Applied Sciences-Basel. 2020; 10(1): 17.
• 21. Haddad R.H. An Anchorage System for Enhanced Bond Behavior between Carbon Fiber Reinforced Polymer Sheets and Cracked Concrete. Latin American Journal of Solids and Structures. 2019; 16(8): 16.
• 22. Kim Y.J., Bhiri M. Grid U-Wrap Anchorage for Reinforced Concrete Beams Strengthened with Carbon Fiber-Reinforced Polymer Sheets. Aci Structural Journal. 2020; 117(1): 3–16.