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Article

  • Title

    Blast load response of one-way reinforced concrete slabs retrofitted with Fiber reinforced plastic

  • Authors

    Rahbar-Ranji Ahmad
    Esmaeli Azar

  • Subject

    MACHINE BUILDING. PROCESS METALLURGY. MATERIALS SCIENCE

  • Year 2018
    Issue 2(55)
    UDC 539.3
    DOI 10.15276/opu.2.55.2018.05
    Pages 49-58
  • Abstract

    The main aim of present work is to investigate structural behavior of one-way reinforced concrete slabs retrofitted with fiber reinforced plastic. Retrofitting is done to enhance bending and shear strength, to increase confinement and to repair damages caused by corrosion and cracking. In retrofitting RC slabs FRP is often used to enhance bending strength by putting it on the tensile side of the slab in the region with maximum anchor, which leads to significant increase in slab’s energy absorption capacity. Finite Element Method (FEM) is widely used in different fields for structural, electrical, heat, and mechanical engineering. In the case of blast analysis, due to excessive cost, the danger of experiments and extremely short duration of the test, numerical simulation is more attractive. Explicit dynamics analysis procedure based on the implementation of an explicit integration rule together with the use of diagonal (“lumped”) element mass matrices is used, which is computationally efficient for the analysis of large models with relatively short dynamic response and for the analysis of extremely discontinuous events or processes. Computer code ABAQUS is used for the analysis and the results are compared with available experimental results in the literature and good agreement has been observed. Also it can be concluded that numerical method used in this study has good agreement with experimental work. Influence of different geometrical parameters including number of layers, orientation of the fibers and the aspect ratio of slab has been investigated. Upon comparison with available experimental results, it is shown that modeling techniques have good accuracy. It is found that regardless of the orientation of the fibers, displacement of the center of slab would be reduced significantly. When fibers orientation angle with respect to the main load bearing direction of the slab is [–20°, 20°], the blast strength of the slab is maximum. For slabs with low aspect ratio, the more the number of layers, the higher the blast strength. For slabs with high aspect ratio, there is no significant difference between different fiber arrangements and increasing number of layers has no significant effect on blast strength of slabs.

     

     

  • Keywords Blast Load; FRP Layer; Finite Element Method; Reinforced Concrete Slab; retrofitting
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  • References

     

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    21. Jones J., Wu C., Oehlers D.J., Rebentrost M., Leach J., Whittaker A.S., Sun W., Marks S., Coppola R. Finite difference analysis of simply supported RC slabs for blast loadings. Journal of Engineering Structures. 2009. Vol. 31. Issue 12. P. 2825–2832. DOI: https//doi.org/10.1016/j.engstruct.2009.07.011.
     


    1. Teng, J.G., Chen, J.F., Smith, S.T., & Lam, L. (2003). Behavior and strength of FRP-strengthened RC structures: а state-of-the-art review. Proceedings of the Institution of Civil Engineers - Structures and Buildings, 156, 1, 51–62. DOI: https//doi.org/10.1680/stbu.2003.156.1.51.
    2. Wu, Y.F., & Huang, Y. (2008). Hybrid bonding of FRP to reinforced concrete structures. Journal of Composites for Construction, 12, 3, 266–273. DOI: https//doi.org/10.1061/(ASCE)1090-0268(2008)12:3(266).
    3. Jin-Won Nam, N., Ho-Jin, K., Sung-Bae, K., Na-Hyun, Y. & Jang-Ho, K. J. (2010). Numerical evaluation of the retrofit effectiveness for GFRP retrofitted concrete slab subjected to blast pressure. Composite Structures, 92, 5, 1212–1222. DOI: https//doi.org/10.1016/j.compstruct.2009.10.031.
    4. Muzsynski, L., & Purcell, M. (2003). Composite reinforcement to strengthen existing concrete structures against air blast. Journal of Composites for Construction, 7, 2, 93–97. DOI: https//doi.org/10.1061/(ASCE)1090-0268(2003)7:2(93).
    5. Lu, B., Silva, P., Nanni, A., & Baird, J. (2005). Retrofit for blast-resistant RC Slabs with composite materials. Missouri: University of Missouri-Rolla, 230, 1345–1360.
    6. Wu, C., Oehlers, D.J., Wachl, J., Glynn, C., Spencer, A., Matthew, M., & Day, I. (2007). Blast Testing of RC Slabs Retrofitted with NSM CFRP Plates. Advances in Structural Engineering, 10, 4, 397–414. DOI: https//doi.org/10.1260 /136943307783239372.
    7. Silva, P.F., & Lu, B. (2007). Improving the blast resistance capacity of RC slabs with innovative composite materials. Composites Part B: Engineering, 38, 5–6, 523–534. DOI: https//doi.org/10.1016/j.compositesb.2006.06.015.
    8. Bibiana, M.L., & Luege, M. (2006). Concrete pavement slab under blast loads. International Journal of Impact Engineering, 32, 8, 1248–1266. DOI: https//doi.org/10.1016/j.ijimpeng.2004.09.005.
    9. Low, H.Y., & Hao, H. (2001). Reliability analysis of reinforced concrete slabs under explosive loading. Structural Safety, 32, 2, 157–178. DOI: https//doi.org/10.1016/S0167-4730(01)00011-X.
    10. Tai, Y.S., Chu, T.L., Hu, H.T., & Wu, J.Y. (2011). Dynamic response of a reinforced concrete slab subjected to air blast load. Theoretical and Applied Fracture Mechanics, 56, 3, 140–147. DOI: https//doi.org/10.1016/j.tafmec.2011.11.002.
    11. Low, H., Hao, H., & Ma, G.W. (1998). Numerical Simulation of Dynamic Responses of RC Slabs Under Blast Loading. Int. symposium on strength theory. Application development & prospects for 21 st century.
    12. Mosalam, M.K., & Mosallam, A.S. (2001). Nonlinear transient analysis of reinforced concrete slabs subjected to blast loading and retrofitted with CFRP composites. Composites Part B: Engineering, 32, 8, 623–636. DOI: https//doi.org/10.1016/S1359-8368(01)00044-0.
    13. Castedo, R., Segarra, P., Alanon, A., Lopez, L.M., Santos, A.P. & Sanchidrian, J.A. (2015). Air blast resistance of full-scale slabs with different compositions: Numerical modeling and field validation. International Journal of Impact Engineering, 86, 145–156. DOI: https//doi.org/10.1016/j.ijimpeng.2015.08.004.
    14. Li, J., Wu, C., & Hao, H. (2015). An experimental and numerical study of reinforced ultra-high performance concrete slabs under blast loads. Materials & Design, 82, 64–76. DOI: https//doi.org/10.1016/j.matdes.2015.05.045.
    15. Yao, S., Zhang, D., Chen, X., Lu, F., & Wang, W. (2016). Experimental and numerical study on the dynamic response of RC slabs under blast loading. Engineering Failure Analysis, 86, 120–129. DOI: https//doi.org/10.1016/j.engfailanal.2016.04.027.
    16. ABAQUS standard user’s manual. Ver. 6.10-1. (2010).
    17. Orakcal, K., Massone, L.M., & Wallace, J.W. (2006). Analytical modelling of reinforced concrete walls for predicting flexural and coupled-shear-flexural responses. University of California, Los Angeles. PEER report.
    18. Shima, H, Chou, L, & Okamura, H. (1987). Micro and macro models for bond in reinforced concrete. Journal of Faculty of Engineering, 39, 2, 133–94.
    19. May, G.C., & Smith, P.D. (1995). Blast effects on buildings. Thomas Telford Ltd., London, E14 4 JD.
    20. Wu, C., Oehlers, D.J., Rebentrost, M., Leach, J., & Whittaker, A.S. (2009). Blast testing of ultra-high performance fiber and FRP-retrofitted concrete slabs. Journal of Engineering Structures, 31, 9, 2060–2069. DOI: https//doi.org/10.1016/j.engstruct.2009.03.020.
    21. Jones, J., Wu, C., Oehlers, D.J., Rebentrost, M., Leach, J., Whittaker, A.S., Sun, W., Marks, S., & Coppola, R. (2009). Finite difference analysis of simply supported RC slabs for blast loadings. Journal of Engineering Structures, 31, 12, 2825–2832. DOI: https//doi.org/10.1016/j.engstruct.2009.07.011.

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