Steel and Composite Structures

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Experimental behaviours of steel tube confined concrete (STCC) columns

  • Han, Lin-Hai (Department of Civil Engineering, Tsinghua University) ;
  • Yao, Guo-Huang (College of Civil Engineering and Architecture, Fuzhou University) ;
  • Chen, Zhi-Bo (College of Civil Engineering and Architecture, Fuzhou University) ;
  • Yu, Qing (Institute of International Engineering Project Management, Tsinghua University)
  • Received : 2004.11.02
  • Accepted : 2005.05.06
  • Published : 2005.12.25
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Abstract

In recent years, the use of steel tube confined concrete (STCC) columns has been the interests of many structural engineers. The present study is an attempt to study the monotonic and cyclic behaviours of STCC columns. For the monotonic behaviours, a series of tests on STCC stub columns (twenty one), and beam-columns (twenty) were carried out. The main parameters varied in the tests are: (1) column section types, circular and square; (2) tube diameter (or width) to thickness ratio, from 40 to 162, and (3) load eccentricity ratio (e/r), from 0 to 0.5. For the cyclic behaviours, the test parameters included the sectional types and the axial load level (n). Twelve STCC column specimens, including 6 specimens with circular sections and 6 specimens with square sections were tested under constant axial load and cyclically increasing flexural loading. Comparisons are made with predicted column strengths and flexural stiffness using the existing codes. It was found that STCC columns exhibit very high levels of energy dissipation and ductility, particularly when subjected to high axial loads. Generally, the energy dissipation ability of the columns with circular sections was much higher than those of the specimens with square sections. Comparisons are made with predicted column strengths and flexural stiffness using the existing codes such as AIJ-1997, AISCLRFD- 1994, BS5400-1979 and EC4-1994.

Keywords

References

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