Advertisement

Materials and Structures

, 51:145 | Cite as

Behavior of concrete columns reinforced with high-strength steel rebars under eccentric loading

  • Sayedmahdi Alavi-DehkordiEmail author
  • Davood Mostofinejad
Original Article
  • 149 Downloads

Abstract

In this study, high-strength steel (HSS) reinforcement with a yield stress of about 600 MPa was used in reinforced concrete columns to reduce both the reinforcing bar congestion and the construction costs. For this purpose, 16 square concrete columns reinforced with either the conventional normal-strength steel (NSS) or HSS rebars were subjected to axial and eccentric compression loads. The primary test variables included longitudinal reinforcement with two strength grades, axial load eccentricities, two different concrete compressive strengths, and different longitudinal reinforcement ratios. The structural response of the columns reinforced with reduced HSS rebars (Grade 600) was compared with that of the columns reinforced with grade 420 MPa rebars in terms of their load-carrying capacity, failure mechanism, axial force-bending moment (P-M) interaction, and ductility. Experimental results showed that although the amount of longitudinal steel reinforcement was reduced by about 34% in columns containing grade 600 MPa rebars, their load-carrying capacity and PM interaction diagrams were comparable to those of the reference columns containing conventional NSS rebars. It was also concluded that simultaneous use of high-strength rebars and high-strength concrete below a balanced point would lead to slightly higher values of ductility index (by up to 4%) than when normal concrete strength and conventional reinforcement steel rebars of Grade 420 MPa are used.

Keywords

High-strength steel (HSS) Eccentric loading Reinforced concrete column High-strength concrete Ductility PM interaction diagram 

Notes

Acknowledgements

The Department of Civil Engineering and its staff in the structural laboratory at Isfahan University of Technology (IUT) are appreciated for their invaluable support. Furthermore, Kavir Steel Complex Inc. and its manager Mr. Khorvash are acknowledged for providing the steel rebars and some other supports throughout this study. Moreover, the encouragements and support of Road, Housing and Urban Development Research Center (BHRC), Iran, throughout the fulfillment of this study are greatly appreciated.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

References

  1. 1.
    Hognestad E (1961) High strength bars as concrete reinforcement, Part 1—introduction to a series of experimental reports. J PCA Res Develop Lab 3:23–29Google Scholar
  2. 2.
    Richart FE, Brown RL (1934) An investigation of reinforced concrete columns: a report of an investigation. University of Illinois, Engineering Experiment Station, College StationGoogle Scholar
  3. 3.
    Pfister JF, Mattock AH (1963) High strength bars as concrete reinforcement, part 5—lapped splices in concentrically loaded columns. J PCA Res Develop Lab 5:27–40Google Scholar
  4. 4.
    Todeschini CE, Bianchini AC, Kesler CE (1964) Behavior of concrete columns reinforced with high strength steels. ACI Struct J 61:701–715Google Scholar
  5. 5.
    Nagashima T, Sugano S, Kimura H, Ichikawa A (1992) Monotonic axial compression test on ultra-high-strength concrete tied columns. In: Proceedings of the 10th world conference on earthquake engineering, Madrid, pp 2983–2988Google Scholar
  6. 6.
    ACI Committee 318 (1971) Building code requirements for reinforced concrete, ACI 318-71. American Concrete Institute, Farmington HillsGoogle Scholar
  7. 7.
    ACI Committee 318 (2014) Building code requirements for structural concrete, ACI 318-14. American Concrete Institute, Farmington HillsGoogle Scholar
  8. 8.
    ACI Innovation Task Group 6 (2010) Design guide for the use of ASTM A1035/A1035M grade 100 steel bars for structural concrete (ACI ITG-6R-10). American Concrete Institute, Farmington HillsGoogle Scholar
  9. 9.
    ACI Committee 318 (2008) Building code requirements for reinforced concrete, ACI 318-08. American Concrete Institute, Farmington HillsGoogle Scholar
  10. 10.
    Shin H-O, Yoon Y-S, Cook WD, Mitchell D (2016) Axial load response of ultra-high-strength concrete columns and high-strength reinforcement. ACI Struct J 113:325Google Scholar
  11. 11.
    Cusson D, Paultre P (1994) High-strength concrete columns confined by rectangular ties. J Struct Eng 120:783–804CrossRefGoogle Scholar
  12. 12.
    Pessiki S, Graybeal BA (2000) Axial load tests of concrete compression members with high strength spiral reinforcement. PCI J 45:64–80CrossRefGoogle Scholar
  13. 13.
    Martinez S, Nilson AH, Slate FO (1982) Spirally reinforced high strength concrete columns. Cornell University Department of Structural Engineering, Research Report No. 82-10, p 255Google Scholar
  14. 14.
    Nishiyama M, Fukushima I, Watanabe F, Muguruma H (1993) Axial loading tests on high-strength concrete prisms confined by ordinary and high-strength steel. In: Proceedings of the symposium on high strength concrete, Norway, pp 322–329Google Scholar
  15. 15.
    Tamm H (2003) Manual Técnico Thermex-HSE. Hennigsdorf, Hennigsdorfer Stahl Engineering, p 28Google Scholar
  16. 16.
    ACI Committee 211.1 (1991) Proportions for normal, heavyweight, and mass concrete (Reapproved 2009), ACI 211.1-91. American Concrete Institute, Farmington HillsGoogle Scholar
  17. 17.
    ASTM C39/C39M (2015) Standard test method for compressive strength of cylindrical concrete specimens. ASTM C39/C39M, West ConshohockenGoogle Scholar
  18. 18.
    Pessiki S, Graybeal B, Mudlock M (2002) Design of high strength spiral reinforcement in concrete compression members. Adv Build Technol 1:431–438CrossRefGoogle Scholar
  19. 19.
    Carey SA, Harries KA (2005) Axial behavior and modeling of confined small-, medium-, and large-scale circular sections with carbon fiber-reinforced polymer jackets. ACI Struct J 102:596Google Scholar
  20. 20.
    Foster SJ, Attard MM (1997) Experimental tests on eccentrically loaded high-strength concrete columns. ACI Struct J 94:2295–2303Google Scholar
  21. 21.
    Priestley MJN, Park R (1987) Strength and ductility of concrete bridge columns under seismic loading. ACI Struct J 84:61–76Google Scholar
  22. 22.
    Jin L, Du M, Li D et al (2017) Effects of cross section size and transverse rebar on the behavior of short squared RC columns under axial compression. Eng Struct 142:223–239CrossRefGoogle Scholar
  23. 23.
    Xu C, Jin L, Ding Z et al (2016) Size effect tests of high-strength RC columns under eccentric loading. Eng Struct 126:78–91CrossRefGoogle Scholar

Copyright information

© RILEM 2018

Authors and Affiliations

  1. 1.Department of Civil EngineeringIsfahan University of Technology (IUT)IsfahanIran

Personalised recommendations