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Eliminating concrete cover separation of NSM strengthened beams by CFRP end anchorage
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 Title & Authors
Eliminating concrete cover separation of NSM strengthened beams by CFRP end anchorage
Hosen, Md. Akter; Jumaat, Mohd Zamin; Islam, A.B.M. Saiful; Kamruzzaman, Mohamed; Huda, Md. Nazmul; Soeb, Mahmudur Rahman;
 Abstract
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.
 Keywords
polymer composites;flexural strengthening;finite element modeling;NSM-steel;debonding;end anchorage;CFRP fabrics;
 Language
English
 Cited by
1.
Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements, Construction and Building Materials, 2016, 122, 1  crossref(new windwow)
 References
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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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.

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

19.
Novidis, D., Pantazopoulou, S. and Tentolouris, E. (2007), "Experimental study of bond of NSM-FRP reinforcement", Constr. Build. Mater., 21(8), 1760-1770. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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. crossref(new window)

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.