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Structural Engineering and Mechanics
  Volume 19, Number 6, April20 2005 , pages 653-677

Study on strength of reinforced concrete filled circular steel tubular columns
Wei Hua, Hai-Jun Wang, Akira Hasegawa, Yukitake Shioi, Shoji Iwasaki, and Yutaka Miyamoto

    Concrete filled steel tubular columns (CFT) are widely used in civil engineering works, especially in large scale of works because of high strength, deformation, toughness and so on. On the other hand, as a kind of strengthening measure for seriously damaged reinforced concrete piers of viaduct in Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate. Then, a new kind of structure appeared, that is, reinforced concrete filled steel tubular column (RCFT). In this paper, compression test and bending-shearing test on RCFT are carried out. The main parameters of experiments are (1) strength of concrete, (2) steel tube with or without rib, (3) width-thickness ratio and (4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters on mechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula for RCFT column is proposed and tested by experimental results and existed recommendations (AIJ 1997). The strength calculated by the proposal formula is in good agreement with test result. As a result, the proposed evaluation formula can evaluate the strength of RCFT column properly.
Key Words
    reinforced concrete filled steel tubular column; compression test; bending-shearing test; load-carrying capacity; ductility ratio; strength; evaluation formula.
Wei Hua; Department of Civil and Environmental
Engineering, Iwate University, Ueda 4-3-5, Morioka, Iwate 020-8551, Japan (Faculty of Civil Engineering, Shenyang University of Technology)
Hai-Jun Wang; Faculty of Civil Engineering, Shenyang University of Technology, No.58, Xinghua South Street, Tiexi District, Shenyang 110023, China
Akira Hasegawa and Yukitake Shioi; Department of Environmental and Civil Engineering, Hachinohe Univ. of Technology, 88-1 Ohbiraki, Hachinohe 031-8501, Japan
Shoji Iwasaki and Yutaka Miyamoto; Department of Civil and Environmental Engineering, Iwate University, Ueda 4-3-5, Morioka, Iwate 020-8551, Japan

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