Techno Press


Steel and Composite Structures   Volume 5, Number 6, December 2005, pages 459-484
DOI: http://dx.doi.org/10.12989/scs.2005.5.6.459
 
Experimental behaviours of steel tube confined concrete (STCC) columns
Lin-Hai Han, Guo-Huang Yao, Zhi-Bo Chen and Qing Yu

 
Abstract     [Full Text]
    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, AISC- LRFD-1994, BS5400-1979 and EC4-1994.
 
Key Words
    composite columns; confined concrete; beam columns; design; concrete; hollow sections; seismic design; cyclic load; flexural stiffness; ductility.
 
Address
Lin-Hai Han; Department of Civil Engineering, Tsinghua University, Beijing, 100084, P. R. ChinarnGuo-Huang Yao and Zhi-Bo Chen; College of Civil Engineering and Architecture, Fuzhou University, Gongye Road 523, Fuzhou, Fujian Province, 350002, P. R. ChinarnQing Yu; Institute of International Engineering Project Management, Tsinghua University, Beijing, 100084, P. R. China
 

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