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


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.


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



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.


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Copyright information

© RILEM 2018

Authors and Affiliations

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

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