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International Journal of Steel Structures

, Volume 18, Issue 5, pp 1577–1588 | Cite as

Experimental Study and Confinement Analysis on RC Stub Columns Strengthened with Circular CFST Under Axial Load

  • Hongjun Liang
  • Yiyan Lu
  • Jiyue Hu
  • Jifeng Xue
Article
  • 73 Downloads

Abstract

As the excellent mechanical performance and easy construction of concrete filled steel tubes (CFST) composite structure, it has the potential to be used to strengthen RC pier columns. Therefore, tests were conducted on 2 reinforcement concrete (RC) stub columns and 9 RC columns strengthened with circular CFST under axial loading. The test results show that the circular CFST strengthening method is effective since the mean bearing capacity of the RC columns is increased at least 3.69 times and the ductility index is significantly improved more than 30%. One of the reasons for enhancement is obvious confinement provided by steel tube besides the additional bearing capacity supplied by the strengthening materials. From the analysis of the enhancement ratio, the strengthening structure has at least an extra 20% amplification except for taking full advantage of the strength of the strengthening material. Through the analysis of confining stress provided by steel tube and the stress–strain relationship of confined concrete, it is found that the strength of the core concrete can be increased by 21–33% and the ultimate strain can be enhanced to beyond 15,000 με.

Keywords

RC columns Circular CFST Strengthening method Axial loading 

Notes

Acknowledgements

The tests reported herein were made possible by the financial support from National Natural Science Foundation of China (Grant Nos. 51708240 and 51678456).

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Copyright information

© Korean Society of Steel Construction 2018

Authors and Affiliations

  • Hongjun Liang
    • 1
    • 2
  • Yiyan Lu
    • 2
  • Jiyue Hu
    • 2
  • Jifeng Xue
    • 2
  1. 1.School of Civil Engineering and MechanicsHuazhong University of Science and TechnologyWuhanChina
  2. 2.School of Civil EngineeringWuhan UniversityWuhanChina

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