DOI QR코드

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Bond strength characterization and estimation of steel fibre reinforced polymer - concrete composites

  • 투고 : 2021.04.18
  • 심사 : 2022.09.19
  • 발행 : 2022.09.25

초록

Composite materials are effective in forming externally bonded reinforcements which find applications related to existing structures repair, attributed to their high strength-to-weight ratio and ease of installation. Among various composites, fibre reinforced polymers (FRP) have somewhat been largely accepted as a commonly utilized composite for such purposes. It is only recently that steel fibres have been considered as additional members of the FRP fibre family, intuitively termed as steel reinforced polymer (SRP). Owing to its low cost and permissibility of fibre bending at sharp corners, SRP is rapidly becoming a viable contender to other FRP systems. This paper investigates the bond behaviour of SRP-concrete joints with different bonded lengths (50, 75, 100, 150 and 300 mm) and widths (15, 30, 40, 50, and 75 mm) using single-lap shear tests. The experimental specimens contain SRP strips with a fixed density of steel fibres (0.472 cords/mm) bonded to the face of concrete prisms. The load responses were obtained and compared in terms of corresponding load and slip boundaries of the constant region and the peak loads. The failure modes of SRP composites are discussed, and the range of effective bonded length is evaluated herein. In the end, a new analytical model was proposed to estimate the SRP-concrete bond strength using a genetic algorithm, which outperforms 22 existing FRP-concrete bond strength models.

키워드

과제정보

The authors sincerely thank Dr. Christian Carloni and the technicians CIRI (Interdepartmental Centre for Industrial Research in Building and Construction) for sharing their knowledge and wisdom throughout this research during the first author's sabbatical leave at the University of Bologna, Italy. Also, not forget Kerakoll S.P.A., Italy, whom the authors acknowledge for providing composite materials for testing.

참고문헌

  1. Adhikary, B. and Mutsuyoshi, H. (2001), "Study on the Bond between Concrete and Externally Bonded CFRP Sheets", Proceeding of the 5th International Symposium on Fiber Reinforcement Structures, Cambridge, UK, 371-378.
  2. ACI 440.2R-08 (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Srengthening Existing Structures, American Concrete Institute, Farmington Hills, MI, USA.
  3. ACI 549.4R-13 (2013), Guide to Design and Construction of Externally Bonded Fabric-Reinforced Cementitious Matrix (FRCM) Systems for Repair and Strengthening Concrete and Masonry Structures, American Concrete Institute, Farmington Hills, MI, USA.
  4. Ascione, F., Lamberti, A., Razaqpur, A.G. and Realfonzo, R. (2019), "Modeling SRP-concrete interfacial bond behavior and strength", Eng. Struct., 187, 220-230. https://doi.org/10.1016/j.engstruct.2019.02.050.
  5. Ascione, F., Lamberti, A., Razaqpur, G. and Realfonzo, R. (2017), "An experimental investigation on the bond behavior of steel reinforced polymers on concrete substrate", Compos. Struct., 181, 58-72. https://doi.org/10.1016/j.compstruct.2017.08.063.
  6. Babatunde, S.A. (2017), "Review of strengthening techniques for masonry using fiber reinforced polymers", Compos. Struct., 161, 246-255. https://doi.org/10.1016/j.compstruct.2016.10.132.
  7. Baggio, D., Soudki, K. and Noel, M. (2014), "Strengthening of shear critical RC beams with various FRP systems", Constr. Build. Mater., 66. https://doi.org/10.1016/j.conbuildmat.2014.05.097.
  8. Bagheri, M., Chahkandi, A. and Jahangir, H., (2019), "Seismic reliability analysis of RC frames rehabilitated by glass fiberreinforced polymers", Int. J. Civ. Eng., 17(11), 1785-1797. https://doi.org/10.1007/s40999-019-00438-x.
  9. Bao, Y., Wang, Y., Gao, H., Liu, X. and Zhang, Y. (2019), "Investigation on temperature field of unidirectional carbon fiber/epoxy composites during drilling process", J. Cent. South Univ., 26, 2717-2728. https://doi.org/10.1007/s11771-019-4208-2.
  10. Bencardino, F., Condello, A. and Ashour, A.F. (2017), "Single-lap shear bond tests on Steel Reinforced Geopolymeric Matrixconcrete joints", Compos. Part B Eng., 110, 62-71. https://doi.org/10.1016/j.compositesb.2016.11.005.
  11. Casadei, P. and Girardello, P. (2019), "SRG composite systems for strengthening masonry structures: From laboratory to field applications", Struct. Ana. Hist. Const., 1, 1715-1724. https://doi.org/10.1007/978-3-319-99441-3_184.
  12. Dai, J., Ueda, T. and Sato, Y. (2005), "Development of the nonlinear bond stress-slip model of fiber reinforced plastics sheet-concrete interfaces with a simple method", J. Compos. Constr., 9, 52-62. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:1(52).
  13. De Lorenzis, L., Miller, B. and Nanni, A. (2001), "Bond of FRP laminates to concrete", ACI Mater. J., 98, 256-264.
  14. Djafar-Henni, I. and Kassoul, A. (2018), "Stress-strain model of confined concrete with Aramid FRP wraps", Constr. Build. Mater., 186, 1016-1030. https://doi.org/10.1016/j.conbuildmat.2018.08.013.
  15. Elchalakani, M., Ma, G., Aslani, F. and Duan, W. (2017), "Design of GFRP-reinforced rectangular concrete columns under eccentric axial loading", Mag. Concr. Res., 69, 865-877. https://doi.org/10.1680/jmacr.16.00437.
  16. EN 2009 (2000), Testing Hardened Concrete: Tensile Splitting Strength of Test Specimens, Br. Stand. Institution, London.
  17. EN 2009 (2000), Testing Hardened Concrete--Part 3: Compressive Strength of Test Specimens, London Br. Stand. Inst.
  18. Ghalehnovi, M., Karimipour, A., Anvari, A. and De Brito, J. (2021), "Flexural strength enhancement of recycled aggregate concrete beams with steel fibre-reinforced concrete jacket", Eng. Struct., 240, 112325. https://doi.org/10.1016/j.engstruct.2021.112325.
  19. Grande, E., Imbimbo, M. and Sacco, E. (2015), "Investigation on the bond behavior of clay bricks reinforced with SRP and SRG strengthening systems", Mater. Struct., 48, 3755-3770. https://doi.org/10.1617/s11527-014-0437-x.
  20. HB 305 (2008), Design Handbook for RC Structures Retrofitted with FRP and Metal Plates: Beams and Slabs, Sydney, NSW: Standards Australia.
  21. Hiroyuki, Y. and Wu, Z. (1997), "Analysis of debonding fracture properties of CFS strengthened member subject to tension, in: Non-Metallic (FRP) Reinforcement for Concrete Structures", Proceedings of the 3rd International Symposium. Japan Concrete Institute, Tokyo, Japan, 287-294.
  22. CNR-DT (2004), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures, Italian National Research Council; Rome (Italy).
  23. Izumo, K., Saeki, N., Fukao, M. and Horiguchi, T. (2000), "Bond behavior and strength between fiber sheets and concrete", Trans. Japan Concr. Inst., 21, 423-430.
  24. Jabbar, A.S.A., Alam, M.A. and Mustapha, K.N. (2016), "Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete", Steel Compos. Struct., 20, 1275-1303. https://doi.org/10.12989/scs.2016.20.6.1275.
  25. Jahangir, H. and Esfahani, M.R. (2020), "Experimental analysis on tensile strengthening properties of steel and glass fiber reinforced inorganic matrix composites", Sci. Iran. https://doi.org/10.24200/SCI.2020.54787.3921.
  26. Jahangir, H. and Esfahani, M.R. (2020), "Investigating loading rate and fibre densities influence on SRG - concrete bond behaviour", Steel Compos. Struct., 34, 877-889. https://doi.org/10.12989/scs.2020.34.6.877.
  27. Jahangir, H. and Esfahani, M.R. (2018a), "Numerical study of bond-Slip mechanism in advanced externally bonded strengthening composites", KSCE J. Civ. Eng., 22, 4509-4518. https://doi.org/10.1007/s12205-018-1662-6
  28. Jahangir, H. and Esfahani, M.R. (2018b), "Strain of newly-developed composites relationship in flexural tests (In Persian)", J. Struct. Constr. Eng., 5, 92-107. https://doi.org/10.22065/jsce.2017.91828.1255.
  29. Jahangir, H. and Rezazadeh Eidgahee, D. (2021), "A new and robust hybrid artificial bee colony algorithm - ANN model for FRP-concrete bond strength evaluation", Compos. Struct., 257, 113160. https://doi.org/10.1016/j.compstruct.2020.113160.
  30. JCI (2003), "Technical Report of Technical Committee on Retrofit Technology", Proc., Int. Symp. on the Latest Achievement of Technology and Research on Retrofitting Concrete Structures, Japan Concrete Institute, Japan.
  31. Karimipour, A. and Edalati, M., (2021), "Retrofitting of the corroded reinforced concrete columns with CFRP and GFRP fabrics under different corrosion levels", Eng. Struct., 228, 111523. https://doi.org/10.1016/j.engstruct.2020.111523.
  32. Kerakoll S.P.A. (2021), www.kerakoll.com
  33. Khalifa, A., Gold, W.J., Nanni, A. and M.I., A.A., (1998), "Contribution of externally bonded FRP to shear capacity of RC flexural members", J. Compos. Constr., 2, 195-202. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:4(195).
  34. Li, W., Li, J., Ren, X., Leung, C.K. and Xing, F. (2015), "Coupling effect of concrete strength and bonding length on bond behaviors of fiber reinforced polymer-concrete interface", J. Reinf. Plast. Compos., 34, 421-432. https://doi.org/10.1177/0731684415573816.
  35. Lu, L., Song, H. and Huang, C. (2017), "Effects of random damages on dynamic behavior of metallic sandwich panel with truss core", Compos. Part B Eng., 116, 278-290. https://doi.org/10.1016/j.compositesb.2016.10.051.
  36. Lu, X.Z., Teng, J.G., Ye, L.P. and Jiang, J.J. (2005), "Bond-slip models for FRP sheets/plates bonded to concrete", Eng. Struct., 27, 920-937. https://doi.org/10.1016/j.engstruct.2005.01.014.
  37. Maeda, T., Asano, Y., Sato, Y., Ueda, T. and Kakuta, Y. (1997), "A study on bond mechanism of carbon fiber sheet, in: NonMetallic (FRP) Reinforcement for Concrete Structures", Proceedings of the 3rd International Symposium. Japan Concrete Institute, Tokyo, Japan, 279-285.
  38. Mazzuca, S., Hadad, H.A., Ombres, L. and Nanni, A. (2019), "Mechanical characterization of steel-reinforced grout for strengthening of existing masonry and concrete structures", J. Mater. Civ. Eng., 31(5), 04019037. https://doi.org/10.1061/(ASCE)MT.1943-5533.0002669.
  39. Neto, P., Alfaiate, J., Dias-da-Costa, D. and Vinagre, J. (2016), "Mixed-mode fracture and load misalignment on the assessment of FRP-concrete bond connections", Compos. Struct., 135, 49-60. https://doi.org/10.1016/j.compstruct.2015.08.139.
  40. Park, J. and Yoo, J. (2015), "Flexural and compression behavior for steel structures strengthened with Carbon Fiber Reinforced Polymers (CFRPs) sheet", Steel Compos. Struct. 19, 441-465. https://doi.org/10.12989/scs.2015.19.2.441
  41. Razavizadeh, A., Ghiassi, B. and Oliveira, D.V. (2014), "Bond behavior of SRG-strengthened masonry units: Testing and numerical modeling", Constr. Build. Mater., 64, 387-397. https://doi.org/10.1016/j.conbuildmat.2014.04.070.
  42. Ren, Z., Liu, H. and Zhou, F. (2012), "Double linear strain distribution assumption of RC beam strengthened with externalbonded or near-surface mounted fiber reinforced plastic", J. Cent. South Univ., 19, 3582-3594. https://doi.org/10.1007/s11771-012-1446-y.
  43. Salsavilca, J., Yacila, J., Tarque, N. and Camata, G. (2020), "Experimental and analytical bond behaviour of masonry strengthened with steel reinforced grout (SRG)", Constr. Build. Mater., 238, 117635. https://doi.org/10.1016/j.conbuildmat.2019.117635.
  44. Santandrea, M., Imohamed, I.A.O., Jahangir, H., Carloni, C., Mazzotti, C., De Miranda, S., Ubertini, F. and Casadei, P. (2016), "An investigation of the debonding mechanism in steel FRP- and FRCM-concrete joints", 4th Workshop on The New Boundaries of Structural Concrete. Capri Island, Italy, 289-298.
  45. Sato, Y., Kimura, K. and Kobatake, Y. (1997), "Bond behaviors between CFRP sheet and concrete", J. Struct. Constr. Eng., 500, 75-82. https://doi.org/10.3130/aijs.62.75_5
  46. Serbescu, A., Guadagnini, M. and Pilakoutas, K., (2013), "Standardised double-shear test for determining bond of FRP to concrete and corresponding model development", Compos. Part B Eng., 55, 277-297. https://doi.org/10.1016/j.compositesb.2013.06.019.
  47. Tanaka, T. (1996), Shear Resisting Mechanism of Reinforced Concrete Beams with CFS as Shear Reinforcement. Hokkaido University, Japan.
  48. Tatar, J. and Hamilton, H.R. (2015), "Implementation of bond durability in the design of flexural members with externally bonded FRP", J. Compos. Constr., https://doi.org/10.1061/(ASCE)CC.
  49. TR 55 (2013), Design Guidance for Strengthening Concrete Structures Using Fibre Composites Materials Concrete Society, Concrete Society Committee, Eynsham.
  50. Fib 14 (2001), Externally Bonded FRP Reinforcement for RC Structures. Bulletin FIB (Vol. 14), Lausanne, Switzerland: International Federation for Structural Concrete (fib).
  51. Van Gemert, D. (1980), "Force transfer in epoxy bonded steel/concrete joints", Int. J. Adhes. Adhes., 1, 67-72. https://doi.org/10.1016/0143-7496(80)90060-3.
  52. Wakjira, T.G. and Ebead, U. (2019), "Experimental and analytical study on strengthening of reinforced concrete T-beams in shear using steel reinforced grout (SRG)", Compos. Part B Eng., 177, 107368. https://doi.org/10.1016/j.compositesb.2019.107368.
  53. Wang, X., Ghiassi, B., Oliveira, D.V. and Lam, C.C. (2017), "Modelling the nonlinear behaviour of masonry walls strengthened with textile reinforced mortars", Eng. Struct., 134, 11-24. https://doi.org/10.1016/j.engstruct.2016.12.029.
  54. Wang, X., Lam, C.C. and Iu, V.P. (2018), "Experimental investigation of in-plane shear behaviour of grey clay brick masonry panels strengthened with SRG", Eng. Struct., 162, 84-96. https://doi.org/10.1016/j.engstruct.2018.02.027.
  55. Wang, Y. and Wu, H. (2011), "Size effect of concrete short columns confined with aramid FRP jackets", J. Compos. Constr., 15, 535-544. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000178.
  56. Wu, Y., Zhou, Z., Yang, Q. and Chen, W. (2010), "On shear bond strength of FRP-concrete structures", Eng. Struct. 32, 897-905. https://doi.org/10.1016/j.engstruct.2009.12.017.
  57. Yacila, J., Salsavilca, J., Tarque, N. and Camata, G. (2019), "Experimental assessment of confined masonry walls retrofitted with SRG under lateral cyclic loads", Eng. Struct. 199, 109555. https://doi.org/10.1016/j.engstruct.2019.109555
  58. Yang, Y.X., Yue, Q.R. and Hu, Y.C. (2001), "Experimental study on bond performance between carbon fiber sheets and concrete", J. Build. Struct., 3, 36-41.
  59. Yu, Y., Yin, S. and Na, M. (2019), "Bending performance of TRCstrengthened RC beams with secondary load under chloride erosion", J. Cent. South Univ., 26, 196-206. https://doi.org/10.1007/s11771-019-3993-y
  60. Yuan, C., Chen, W., Pham, T.M. and Hao, H. (2019), "Effect of aggregate size on bond behaviour between basalt fibre reinforced polymer sheets and concrete", Compos. Part B Eng., 158, 459-474. https://doi.org/10.1016/j.compositesb.2018.09.089.
  61. Zampieri, P., Simoncello, N., Tetougueni, C.D. and Pellegrino, C. (2018), "A review of methods for strengthening of masonry arches with composite materials", Eng. Struct., 171, 154-169. https://doi.org/10.1016/j.engstruct.2018.05.070.