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Steel and Composite Structures Volume 14, Number 2, February 2013 , pages 133-153 DOI: https://doi.org/10.12989/scs.2013.14.2.133 |
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Experimental and Analytical Investigation of High-Strength Concrete-filled steel tube Square Columns Subjected to Flexural Loading |
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Kyung-Soo Chung, Jin-Ho Kim and Jung-Han Yoo
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| Abstract | ||
| The concrete-filled steel tube (CFT) columns have several benefits of high load-bearing capacity, inherent ductility and toughness because of the confinement effect of the steel tube on concrete and the restraining effect of the concrete on local buckling of steel tube. However, the experimental research into the behavior of square CFT columns consisting of high-strength steel and high-strength concrete is limited. Six full scale CFT specimens were tested under flexural moment. The CFT columns consisted of high-strength steel tubes (fy=325MPa, 555MPa, 900MPa) and high-strength concrete (fck=80MPa and 120MPa). The ultimate capacity of high strength square CFT columns was compared with AISC-LRFD design code. Also, this study was focused on investigating the effect of high-strength materials on the structural behavior and the mathematical models of the steel tube and concrete. Nonlinear fiber element analyses were conducted based on the material model considering the cyclic bending behavior of high-strength CFT members. The results obtained from the numerical analyses were compared with the experimental results. It was found that the numerical analysis results agree well with the experimental results. | ||
| Key Words | ||
| concrete-filled steel tube; high-strength steel; high-strength concrete; experimental research; nonlinear fiber element analysis | ||
| Address | ||
| Kyung-Soo Chung, Jin-Ho Kim : Steel Structure Research Division, RIST, 180-1 Songdo-Dong, Yeonsu-Gu, Incheon 406-840, Republic of Korea Jung-Han Yoo : School of Architecture, Seoul National University of Science &Technology, 232 Gongreung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea | ||