Structural Engineering and Mechanics

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Effect of rebar spacing on the behavior of concrete slabs under projectile impact

  • Abbas, Husain (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Siddiqui, Nadeem A. (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Almusallam, Tarek H. (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Abadel, Aref A. (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Elsanadedy, Hussein (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University) ;
  • Al-Salloum, Yousef A. (Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, King Saud University)
  • Received : 2019.11.25
  • Accepted : 2020.10.27
  • Published : 2021.02.10
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Abstract

In this paper, the effect of different steel bar configurations on the quasi-static punching and impact response of concrete slabs was studied. A total of forty RC square slab specimens were cast in two groups of concrete strengths of 40 and 63 MPa. In each group of twenty specimens, ten specimens were reinforced at the back face (singly reinforced), and the remaining specimens were reinforced on both faces of the slab (doubly reinforced). Two rebar spacing of 25 and 100 mm, with constant reinforcement ratio and effective depth, were used in both singly and doubly reinforced slab specimens. The specimens were tested against the normal impact of cylindrical projectiles of hemispherical nose shape. Slabs were also quasi-statically tested in punching using the same projectile, which was employed for the impact testing. The experimental response illustrates that 25 mm spaced rebars are effective in (i) decreasing the local damage and overall penetration depth, (ii) increasing the absorption of impact energy, and (iii) enhancing the ballistic limit of RC slabs. The ballistic limit was predicted using the quasi-static punching test results of slab specimens showing a strong correlation between the dynamic perforation energy and the energy required for quasi-static perforation of slabs.

Keywords

Acknowledgement

The authors are grateful to the Deanship of Scientific Research, King Saud University, for funding through Vice Deanship of Scientific Research Chairs.

References

  1. Abbas, H., Abadel, A.A., Almusallam, T. and Al-Salloum, Y. (2015), "Effect of CFRP and TRM strengthening of RC slabs on punching shear strength", Latin American J. Solids Struct., 12(9), 1616-1640. https://doi.org/10.1590/1679-78251277.
  2. Abbas, H., Paul, D.K., Godbole, P.N. and Nayak, G.C. (1996), "Aircraft crash upon outer containment of nuclear power plant", Nuclear Eng. Design, 160(1-2), 13-50. https://doi.org/10.1016/0029-5493(95)01049-1.
  3. Abdel-Kader, M. and Fouda, A. (2014), "Effect of reinforcement on the response of concrete panels to impact of hard projectiles", J. Impact Eng., 63, 1-17. https://doi.org/10.1016/j.ijimpeng.2013.07.005.
  4. ACI Committee 318. (2014), Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary on Building Code Requirements for Structural Concrete (ACI 318R-14), American Concrete Institute, MI, USA.
  5. Al-Gasham, T.S., Mhalhal, J.M. and Jabir, H.A. (2019), "Improving punching behavior of interior voided slab-column connections using steel sheets", Eng. Struct., 199, 109614. https://doi.org/10.1016/j.engstruct.2019.109614.
  6. Almusallam, T.H., Abadel, A.A., Al-Salloum, Y.A., Siddiqui, N.A. and Abbas, H. (2015), "Effectiveness of hybrid-fibers in improving the impact resistance of RC slabs", J. Impact Eng., 81, 61-73. https://doi.org/10.1016/j.ijimpeng.2015.03.010.
  7. Almusallam, T.H., Siddiqui, N.A., Iqbal, R.A. and Abbas, H. (2013), "Response of hybrid-fiber reinforced concrete slabs to hard projectile impact", J. Impact Eng., 58, 17-30. https://doi.org/10.1016/j.ijimpeng.2013.02.005.
  8. ASTM. (2014), "A370: Standard Test Methods and Definitions for Mechanical Testing of Steel Products", ASTM International, PA, USA.
  9. ASTM. (2020), "C39-20 Standart test method for compressive strength of cylindrical concrete specimens", ASTM International, PA, USA.
  10. Dancygier, A.N. (1997), "Effect of reinforcement ratio on the resistance of reinforced concrete to hard projectile impact", Nuclear Eng. Design, 172(1-2), 233-245. https://doi.org/10.1016/s0029-5493(97)00055-1.
  11. Dancygier, A.N., Yankelevsky, D.Z. and Jaegermann, C. (2007), "Response of high performance concrete plates to impact of non-deforming projectiles", J. Impact Eng., 34(11), 1768-1779. https://doi.org/10.1016/j.ijimpeng.2006.09.094.
  12. Donmez, A. and Bazant, Z.P. (2017), "Size effect on punching strength of reinforced concrete slabs with and without shear reinforcement", ACI Struct. J., 114(4), 875-886. http://www.cee.northwestern.edu/people/bazant/PDFs/Papers/581.pdf https://doi.org/10.14359/51689719
  13. Fullard, K., Baum, M.R. and Barr, P. (1991), "The assessment of impact on nuclear power plant structures in the United Kingdom", Nuclear Eng. Design, 130(2), 113-120. https://doi.org/10.1016/0029-5493(91)90120-7.
  14. Goswami, A., Adhikary, S.D. and Li, B. (2019), "Predicting the punching shear failure of concrete slabs under low velocity impact loading", Eng. Struct., 184, 37-51. https://doi.org/10.1016/j.engstruct.2019.01.081.
  15. Li, J., Wu, C., Hao, H. and Su, Y. (2017), "Experimental and numerical study on steel wire mesh reinforced concrete slab under contact explosion", Mater. Design, 116, 77-91. https://doi.org/10.1016/j.matdes.2016.11.098.
  16. Li, Q.M., Reid, S.R., Wen, H.M. and Telford, A.R. (2005), "Local impact effects of hard missiles on concrete targets", J. Impact Eng., 32(1-4), 224-284. https://doi.org/10.1016/j.ijimpeng.2005.04.005.
  17. Mazek, S. A. and Wahab, M. M. A. (2015), "Impact of composite materials on buried structures performance against blast wave", Struct. Eng. Mech., 53(3), 589-605. https://doi.org/10.12989/sem.2015.53.3.589.
  18. Murali, G. and Ramprasad, K. (2018), "A feasibility of enhancing the impact strength of novel layered two stage fibrous concrete slabs", Eng. Struct., 175, 41-49. https://doi.org/10.1016/j.engstruct.2018.08.034.
  19. NDRC. (1945), Effects of Impact and Explosion. Summary Technical Report of Division 2, Vol 1, National Defense Research Committee, Washington, DC., USA.
  20. Oh, H. and Sim, J. (2004), "Punching shear strength of strengthened deck panels with externally bonded plates", Compos. Part B Eng., 35(4), 313-321. https://doi.org/10.1016/j.compositesb.2003.12.003.
  21. Oncu, M. E., Yon, B., Akkoyun, O. and Taskiran, T. (2015), "Investigation of blast-induced ground vibration effects on rural buildings", Struct. Eng. Mech., 54(3), 545-560. https://doi.org/10.12989/sem.2015.54.3.545.
  22. Peng, Y., Wu, H., Fang, Q., Liu, J.Z. and Gong, Z.M. (2016), "Residual velocities of projectiles after normally perforating the thin ultra-high performance steel fiber reinforced concrete slabs", J. Impact Eng., 97, 1-9. https://doi.org/10.1016/j.ijimpeng.2016.06.006.
  23. Rajput, A. and Iqbal, M.A. (2017), "Impact behavior of plain, reinforced and prestressed concrete targets", Mater. Design, 114, 459-474. https://doi.org/10.1016/j.matdes.2016.10.073.
  24. Reinhardt, H.W. and Walraven, J.C. (1982), "Cracks in Concrete Subject to Shear", ASCE J Struct Div, 108(ST1), 207-224. https://cedb.asce.org/CEDBsearch/record.jsp?dockey=0033755. https://doi.org/10.1061/JSDEAG.0005860
  25. Rochdi, E.H., Bigaud, D., Ferrier, E. and Hamelin, P. (2006), "Ultimate behavior of CFRP strengthened RC flat slabs under a centrally applied load", Compos. Struct., 72(1), 69-78. https://doi.org/10.1016/j.compstruct.2004.10.017.
  26. Siddiqui, N.A. and Abbas, H. (2002), "Mechanics of missile penetration into geo-materials", Struct. Eng. Mech., 13(6), 639-652. https://doi.org/10.12989/sem.2002.13.6.639.
  27. Siddiqui, N.A., Khateeb, B.M.A., Almusallam, T.H., Al-Salloum, Y.A., Iqbal, R.A. and Abbas, H. (2014a), "Reliability of RC shielded steel plates against the impact of sharp nose projectiles", J. Impact Eng., 69, 122-135. https://doi.org/10.1016/j.ijimpeng.2014.03.001.
  28. Siddiqui, N.A., Khateeb, B.M.A., Almusallam, T.H. and Abbas, H. (2014b), "Reliability of double-wall containment against the impact of hard projectiles", Nuclear Eng. Design, 270, 143-151. https://doi.org/10.1016/j.nucengdes.2014.01.003.
  29. Siddiqui, N.A., Kumar, S., Khan, M.A. and Abbas, H. (2006), "A simplified procedure to incorporate soil non-linearity in missile penetration problems", Struct. Eng. Mech., 23(3), 249-262. https://doi.org/10.12989/sem.2006.23.3.249.
  30. Sohn, J.M., Kim, S. J., Seong, D.J., Kim, B.J., Ha, Y.C., Seo, J. K. and Paik, J.K. (2014), "Structural impact response characteristics of an explosion-resistant profiled blast walls in arctic conditions", Struct. Eng. Mech., 51(5), 755-771. https://doi.org/10.12989/sem.2014.51.5.755.
  31. Tamayo, J.L.P. and Awruch, A.M. (2016), "Numerical simulation of reinforced concrete nuclear containment under extreme loads", Struct. Eng. Mech., 58(5), 799-823. https://doi.org/10.12989/sem.2016.58.5.799.
  32. Thai, D.K. and Kim, S.E. (2015), "Numerical simulation of reinforced concrete slabs under missile impact", Struct. Eng. Mech., 53(3), 455-479. https://doi.org/10.12989/sem.2015.53.3.455.
  33. Verma, M., Prem, P.R., Rajasankar, J. and Bharatkumar, B.H. (2016), "On low-energy impact response of ultra-high performance concrete (UHPC) panels", Mater. Design, 92, 853-865. https://doi.org/10.1016/j.matdes.2015.12.065.
  34. Wang, J., Yuan, W., Wu, X. and Wei, K. (2017), "Dynamic performance of girder bridges with explosion-proof and aseismic system", Struct. Eng. Mech., 61(3), 419-426. https://doi.org/10.12989/sem.2017.61.3.419.
  35. Wu, H., Fang, Q., Peng, Y., Gong, Z. M. and Kong, X. Z. (2015), "Hard projectile perforation on the monolithic and segmented RC panels with a rear steel liner", J. Impact Eng., 76, 232-250. https://doi.org/10.1016/j.ijimpeng.2014.10.010.
  36. Xu, X., Ma, T. and Ning, J. (2019), "Failure mechanism of reinforced concrete subjected to projectile impact loading", Eng. Failure Analysis, 96, 468-483. https://doi.org/10.1016/j.engfailanal.2018.11.006.
  37. Zineddin, M. and Krauthammer, T. (2007), "Dynamic response and behavior of reinforced concrete slabs under impact loading", J. Impact Eng., 34(9), 1517-1534. https://doi.org/10.1016/j.ijimpeng.2006.10.012.