Advances in concrete construction

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Effect of shape and amount of transverse reinforcement on lateral confinement of normal-strength concrete columns

  • Kim, Hyeong-Gook (Department of Architectural & Urban System Engineering, Kongju National University) ;
  • Kim, Kil-Hee (Department of Architectural & Urban System Engineering, Kongju National University)
  • Received : 2022.01.14
  • Accepted : 2022.08.05
  • Published : 2022.08.25
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Abstract

The amount and configuration of transverse reinforcement are known as critical parameters that significantly affect the lateral confinement of concrete, the ductility capacity, and the plastic hinge length of RC columns. Based on test results, this study investigated the effect of the three variables on structural indexes such as neutral axis depth, lateral expansion of concrete, and ductility capacity. Five reinforced concrete column specimens were tested under cyclic flexure and shear while simultaneously subjected to a constant axial load. The columns were reinforced by two types of reinforcing steel: rectangular hoops and spiral type reinforcing bars. The variables in the test program were the shape, diameter, and yield strength of transverse reinforcement. The interactive influence of the amount of transverse reinforcement on the structural indexes was evaluated. Test results showed that when amounts of transverse reinforcement were similar, and yield strength of transverse reinforcement was 600 MPa or less, the neutral axis depth of a column with spiral type reinforcing bars was reduced by 28% compared with that of a column reinforced by existing rectangular hoops at peak strength. While the diagonal elements of spiral-type reinforcing bars significantly contributed to the lateral confinement of concrete, the strain of diagonal elements decreased with increases of their yield strength. It was confirmed that shapes of transverse reinforcement significantly affected the lateral confinement of concrete adjacent to plastic hinges. Transverse reinforcement with a yield strength exceeding 600 MPa, however, increased the neutral axis depth of normal-strength concrete columns at peak strength, resulting in reductions in ductility and energy dissipation capacity.

Keywords

Acknowledgement

This research was supported by UNDERGROUND CITY OF THE FUTURE program funded by the Ministry of Science and ICT.

References

  1. ACI Committee (2019), Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary, American Concrete Institute, Farmington Hills, MI, USA.
  2. Bai, J. and Li, S. (2021), "Seismic behavior of prefabricated highstrength concrete columns confined by overlapping stirrups", Struct. Eng. Mech., Int. J., 79(5), 579-591. https://doi.org/10.12989/sem.2021.79.5.579
  3. Chitra, M. and Rugmini, B.K. (2021), "Performance of reinforced concrete columns confined with spiral reinforcement", Struct. Des. Tall. Build., 30(10), 1-15. https://doi.org/10.1002/tal.1859
  4. Cusson, D. and Paultre, P. (1994), "High-Strength Concrete Columns Confined by Rectangular Ties", J. Struct. Eng., 120(3), 783-804. https://doi.org/10.1061/(ASCE)0733-9445(1994)120:3(783)
  5. Ding, F., Yin, Y., Wang, L., Yu, Y., Luo, L. and Yu, Z. (2019), "Confinement coefficient of concrete-filled square stainless steel tubular stub columns", Steel Compos. Struct., Int. J., 30(4), 337-350. https://doi.org/10.12989/scs.2019.30.4.337
  6. Domenico, D., Falliano, D. and Ricciardi, G. (2019), "Confinement effect of different arrangements of transverse reinforcement on axially loaded concrete columns: An experimental study", J. Mech. Behav. Mater., 28, 13-19. https://doi.org/10.1515/jmbm-2019-0003
  7. Elsamak, G. and Fayed, S. (2021), "Flexural strength of RC beams using externally bonded aluminum plates: An experimental and numerical study", Adv. Concr. Constr., Int. J., 11(6), 481-492. https://doi.org/10.12989/acc.2021.11.6.481
  8. Halim, N.H.F.A., Alih, S.C. and Vafaei, M. (2021), "Seismic behavior of RC columns internally confined by CFRP strips", Adv. Concr. Constr., Int. J., 12(3), 217-225. https://doi.org/10.12989/acc.2021.12.3.217
  9. JICE (1990), High-strength concrete subcommittee report, Japan Institute of construction Engineering, Tokyo, Japan.
  10. Jing, D.H. and Huang, L.B. (2019), "Effect of transverse reinforcement on rectangular concrete columns with MTSTR", Mag. Concr. Res., 71(2), 1-44. https://doi.org/10.1680/jmacr.17.00380
  11. Kim, H.G., Jeong, C.Y., Kim, D.H. and Kim, K.H. (2020), "Confinement Effect of Reinforced Concrete Columns with Rectangular and Octagon-Shaped Spirals", Sustainability, 12(9), 7981. https://doi.org/10.3390/su12197981
  12. Mander, J.B., Priestley, M.J.N. and Park, R. (1988), "Observed stress-strain behavior of confined concrete", J. Struct. Eng., 114(8), 1827-1849. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1827)
  13. Marinez, S., Nilson, A.H. and Slate, F.O. (1984), "Spirally reinforced high-strength concrete columns", ACI Struct. J., 81(5), 431-442.
  14. Moehle, J. and Cavanagh, T. (1985), "Confinement effectiveness of crossties in RC", J. Struct. Div., 111(10), 2105-2120. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:10(2105)
  15. Moretti, M.L. (2019), "Effectiveness of different confining configurations of FRP Jackets for concrete columns", Struct. Eng. Mech., Int. J., 72(2), 155-168. https://doi.org/10.12989/sem.2019.72.2.155
  16. Muguruma, H. and Watanabe, F. (1990), "Ductility improvement of high-strength concrete columns with lateral confinement", ACI Spec. Publ., 121, 47-60. https://doi.org/10.14359/2783
  17. Muguruma, H., Watanabe, F. and Tanaka, H. (1991), "Ductile Behaviour of High-Strength Columns Confined by High-Strength Transverse Reinforcement", ACI Spec. Publ., 128, 877-891.
  18. Pam, H.J. and Ho, J.C.M. (2011), "Flexural strength enhancement of confined reinforced concrete columns", Proceedings, Institution of Civil Engineers, Struct. Build., 146(4), 363-370. https://doi.org/10.1680/stbu.2001.146.4.363
  19. Park, Y.J. and Ang, A.H.S. (1985), "Mechanistic seismic damage model for reinforced concrete", J. Struct. Eng., 111(4), 722-739. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:4(722)
  20. Park, R. and Pauley, T. (1975), Reinforced Concrete Structures, John Wiley and Sons, New York, USA.
  21. Raoof, S.M., Ibraheem, O.F. and Tais, A.S. (2020), "Confinement effectiveness of CFRP strengthened concrete cylinders subjected to high temperatures", Adv. Concr. Constr., Int. J., 9(6), 529-535. https://doi.org/10.12989/acc.2020.9.6.529
  22. Razvi, S.R. (1992), "Strength and ductility of confined concrete", J. Struct. Eng., 118 (6), 1590-1607. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:6(1590)
  23. Razvi, S.R. and Saatcioglu, M. (1999), "Circular high-strength concrete columns under concentric compression", ACI Struct. J., 96(5), 817-826.
  24. Shamim, A.S. and Shafik, S.K. (1993), "Confined concrete columns with stubs", ACI Struct. J., 90(4), 414-431.
  25. Shamim, A.S. and Shafik, S.K. (1997), "A performance-based approach for the design of confining steel in tied columns", ACI Struct. J., 94(4), 421-431.
  26. Shanan, M.A., El-Zanati, A.H., Anis, A.R. and Metwally, K.G. (2019), "Effect of confinement with lateral reinforcement on normal & high strength concrete columns", Proceedings of the 2019 World congress on Advances in Structural Engineering and Mechanics (ASEM'19), Jeju, Korea, September.
  27. Sheikh, S.A. and Toklucu, M.T. (1993), "Reinforced concrete columns confined by circular spirals and hoops", ACI Struct. J., 90(5), 542-553.
  28. Shin, S.W., Kim, J.K. and Ahn, J.M. (2010), "Transverse reinforcement of RC columns considering effective lateral confining reduction factor", J. Asian Archit. Build. Eng., 9(2), 501-508. https://doi.org/10.3130/jaabe.9.501
  29. Wang, J., Yang, J. and Cheng, L. (2019), "Experimental study of seismic behavior of high-strength RC columns strengthened with CFRP subjected to cyclic loading", J. Struct. Eng., 145(2), 1-14. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002251
  30. Wang, P., Shi, Q., Wang, F. and Wang, Q. (2020), "Seismic behavior of concrete columns with high-strength stirrups", Earthq. Struct., 18(1), 15-25. https://doi.org/10.12989/eas.2020.18.1.015
  31. Yang, K., Shi, Q.X. and Lin, Q. (2021), "Seismic Performance and Confinement Reinforcement Design of High-Strength Concrete Confined with High-Strength Stirrups", Adv. Struct. Eng., 24(10), 2061-2075. https://doi.org/10.1177/1369433221992491
  32. Yi, W.J., Li, P. and Kunnath, S.K. (2012), "Experimental Studies on Confinement Effect of Steel Hoops in Concrete", ACI Struct. J., 109(1), 3-10.
  33. Yong, Y.K., Nour, M.G. and Nawy, E.G. (1989), "Behavior of laterally confined high-strength concrete under axial loads", J. Struct. Eng., 114(2), 332-351. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:2(332)
  34. Zakerinejad, M. and Soltani, M. (2021), "Compressive behavior of RC members with rectangular continuous transverse reinforcement", Struct. Concr., 22(6), 3396-3413. https://doi.org/10.1002/suco.202100066
  35. Zhang, D., Li, N., Li, Z.X. and Xie, L. (2020), "Experimental investigation and confinement model of composite confined concrete using steel jacket and prestressed steel hoop", Constr. Build. Mater., 256(30), 1-13. https://doi.org/10.1016/j.conbuildmat.2020.119399