Structural Engineering and Mechanics

  • 제56권6호
  • /
  • Pages.899-916
  • /
  • 2015
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Eliminating concrete cover separation of NSM strengthened beams by CFRP end anchorage

  • Hosen, Md. Akter (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Jumaat, Mohd Zamin (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Islam, A.B.M. Saiful (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Kamruzzaman, Mohamed (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Huda, Md. Nazmul (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Soeb, Mahmudur Rahman (Department of Civil Engineering, Faculty of Engineering, University of Malaya)
  • 투고 : 2014.12.06
  • 심사 : 2015.11.03
  • 발행 : 2015.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Upgrading or strengthening of existing reinforced concrete (RC) infrastructure is an emerging demand nowadays. Near Surface Mounted (NSM) technique is very promising approach for flexural strengthening of RC members. However, premature failure such as concrete cover separation failure have been a main concern in utilizing this technique. In this study, U-wrap end anchorage with carbon fiber reinforced polymer (CFRP) fabrics is proposed to eliminate the concrete cover separation failure. Experimental programs were conducted to the consequence of U-wrap end anchorage on the flexurally strengthened RC beams with NSM-steel. A total of eight RC rectangular beam specimens were tested. One specimen was kept unstrengthened as a reference; three specimens were strengthened with NSM-steel bars and the remaining four specimens were strengthened with NSM-steel bars and U-wrap end anchorage using CFRP fabrics. A 3D non-linear finite element model (FEM) was developed to simulate the flexural response of the tested specimens. It is revealed that NSM-steel (with and without end-anchors) significantly improved the flexural strength; moreover decreased deflection and strains compared with reference specimen. Furthermore, NSM-steel with end anchorage strengthened specimens revealed the greater flexural strength and improve failure modes (premature to flexure) compared with the NSM-steel without end anchorage specimens. The results also ensured that the U-wrap end anchorage completely eliminate the concrete cover separation failure.

키워드

과제정보

연구 과제 주관 기관 : University of Malaya

참고문헌

  1. ACI-318 (2011). Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary, First Edition, American Concrete Institute.
  2. Al-Mahmoud, F., Castel, A., Francois, R. and Tourneur, C. (2010), "RC beams strengthened with NSM CFRP rods and modeling of peeling-off failure", Compos. Struct., 92(8), 1920-1930. https://doi.org/10.1016/j.compstruct.2010.01.002
  3. Aykac, S., Kalkan, I. and Uysal, A. (2012), "Strengthening of reinforced concrete beams with epoxy-bonded perforated steel plates", Struct. Eng. Mech., 44(6), 735-751. https://doi.org/10.12989/sem.2012.44.6.735
  4. Badawi, M. and Soudki, K. (2009), "Flexural strengthening of RC beams with prestressed NSM CFRP rods-experimental and analytical investigation", Constr. Build. Mater., 23(10), 3292-3300. https://doi.org/10.1016/j.conbuildmat.2009.03.005
  5. Bilotta, A., Ceroni, F., Di Ludovico, M., Nigro, E., Pecce, M. and Manfredi, G. (2011), "Bond efficiency of EBR and NSM FRP systems for strengthening concrete members", J. Compos. Construct., 15(5), 757-772. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000204
  6. Boukhezar, M., Samai, M.L., Mesbah, H.A. and Houari, H. (2013), "Flexural behaviour of reinforced low-strength concrete beams strengthened with CFRP plates", Struct. Eng. Mech., 47(6), 819-838. https://doi.org/10.12989/sem.2013.47.6.819
  7. Capozucca, R. and Bossoletti, S. (2014), "Static and free vibration analysis of RC beams with NSM CFRP rectangular rods", Compos. Part B: Eng., 67, 95-110. https://doi.org/10.1016/j.compositesb.2014.06.005
  8. Cruz, J.S. and Barros, J. (2004), "Modeling of bond between near-surface mounted CFRP laminate strips and concrete", Comput. Struct., 82(17), 1513-1521. https://doi.org/10.1016/j.compstruc.2004.03.047
  9. De Lorenzis, L., Rizzo, A. and La Tegola, A. (2002), "A modified pull-out test for bond of near-surface mounted FRP rods in concrete", Compos. Part B: Eng., 33(8), 589-603. https://doi.org/10.1016/S1359-8368(02)00052-5
  10. De Lorenzis, L. and Teng, J. (2007), "Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures", Compos. Part B: Eng., 38(2), 119-143. https://doi.org/10.1016/j.compositesb.2006.08.003
  11. De Sena Cruz, J.M. and Oliveira de Barros, J.A. (2004), "Bond between near-surface mounted carbon-fiber-reinforced polymer laminate strips and concrete", J. Compos. Construct., 8(6), 519-527. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:6(519)
  12. Demir, A., Tekin, M., Turali, T. and Bagci, M. (2014), "Strengthening of RC beams with prefabricated RC U cross-sectional plates", Struct. Eng. Mech., 49(6), 673-685. https://doi.org/10.12989/sem.2014.49.6.673
  13. El-Hacha, R. and Gaafar, M. (2011), "Flexural strengthening of reinforced concrete beams using prestressed, near-surface-mounted CFRP bars", PCI J., 56(4), 134-151. https://doi.org/10.15554/pcij.09012011.134.151
  14. El-Hacha, R. and Rizkalla, S.H. (2004), "Near-surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures", ACI Struct. J., 101(5), 717-726.
  15. Islam, A.B.M.S., Jameel, M., Jumaat, M.Z. and Rahman, M.M. (2013), "Optimization in structural altitude for seismic base isolation at medium risk earthquake disaster region", Disast. Adv., 6(1), 23-34.
  16. Jung, W.T., Park, Y.H., Park, J.S., Kang, J.Y. and You, Y.J. (2005), "Experimental investigation on flexural behavior of RC beams strengthened by NSM CFRP reinforcements", ACI Spec. Publ., 230, 795-806.
  17. Kishi, N., Mikami, H., Kurihashi, Y. and Sawada, S. (2005), "Flexural behaviour of RC beams reinforced with NSM AFRP rods", Proceedings of the International Symposium on Bond Behaviour of FRP in structures, BBFS 2005.
  18. Mini, K., Alapatt, R.J., David, A.E., Radhakrishnan, A., Cyriac, M.M. and Ramakrishnan, R. (2014), "Experimental study on strengthening of RC beam using glass fibre reinforced composite", Struct. Eng. Mech., 50(3), 275-286. https://doi.org/10.12989/sem.2014.50.3.275
  19. Novidis, D., Pantazopoulou, S. and Tentolouris, E. (2007), "Experimental study of bond of NSM-FRP reinforcement", Constr. Build. Mater., 21(8), 1760-1770. https://doi.org/10.1016/j.conbuildmat.2006.05.054
  20. Ritchie, P.A., Thomas, D.A., Lu, L.W. and Conelly, G.M. (1991), "External reinforcement of concrete beams using fiber reinforced plastics", ACI Struct. J., 88(4), 490-500.
  21. Saadatmanesh, H. and Ehsani, M.R. (1991), "RC beams strengthened with GFRP plates. I: Experimental study", J. Struct. Eng., 117(11), 3417-3433. https://doi.org/10.1061/(ASCE)0733-9445(1991)117:11(3417)
  22. Sharaky, I., Torres, L., Baena, M. and Mias, C. (2013), "An experimental study of different factors affecting the bond of NSM FRP bars in concrete", Compos. Struct., 99, 350-365. https://doi.org/10.1016/j.compstruct.2012.12.014
  23. Sharaky, I., Torres, L., Comas, J. and Barris, C. (2014), "Flexural response of reinforced concrete (RC) beams strengthened with near surface mounted (NSM) fibre reinforced polymer (FRP) bars", Compos. Struct., 109, 8-22. https://doi.org/10.1016/j.compstruct.2013.10.051
  24. Soliman, S.M., El-Salakawy, E. and Benmokrane, B. (2010), "Flexural behaviour of concrete beams strengthened with near surface mounted fibre reinforced polymer bars", Can. J. Civil Eng., 37(10), 1371-1382. https://doi.org/10.1139/L10-077
  25. Teychenne, D., Franklin, R., Erntroy, H., Hobbs, D. and Marsh, B. (1997), Design of normal concrete mixes, 2nd Edition, Building Research Establishment, Watford, UK.

피인용 문헌

  1. Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements vol.122, 2016, https://doi.org/10.1016/j.conbuildmat.2016.06.048
  2. Seismic response variation of multistory base-isolated buildings applying lead rubber bearings vol.21, pp.5, 2015, https://doi.org/10.12989/cac.2018.21.5.495
  3. Efficient parameters to predict the nonlinear behavior of FRP retrofitted RC columns vol.70, pp.6, 2019, https://doi.org/10.12989/sem.2019.70.6.703
  4. Experimental study on effect of EBRIG shear strengthening method on the behavior of RC beams vol.8, pp.2, 2019, https://doi.org/10.12989/acc.2019.8.2.145
  5. Flexural Performance of RC Beams Strengthened with Externally-Side Bonded Reinforcement (E-SBR) Technique Using CFRP Composites vol.14, pp.11, 2021, https://doi.org/10.3390/ma14112809
  6. Experimental and numerical investigations on a novel plate anchorage system to solve FRP debonding problem in the strengthened RC beams vol.45, pp.None, 2015, https://doi.org/10.1016/j.jobe.2021.103413