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Steel and Composite Structures
  Volume 44, Number 1, July10 2022 , pages 1-15

Exposed Reinforced Concrete-Filled Steel Tubular (RCFST) column-base joint with high-strength
Ben Mou, Zian Wang, Qiyun Qiao and Wanqiu Zhou

    The weld quality has always been an important factor affecting the development of exposed CFT column-base joint. In this paper, a new type of exposed RCFST column-base joint is proposed, in which the high strength steel bars (USD 685) are set through the column and reinforced concrete foundation without any base plate and anchor bolts. Three specimens, the varying axial force ratio (0, 0.25 and 0.5), were tested under cyclic loadings. In addition, the bending moment capacity, energy dissipation capacity and deformation capacity of column-base joints were clarified. The experimental results indicated that the axial force ratio increases the stiffness and the bending moment and improves the energy dissipation capacity of column-base joints. This is because a large axial force can limit the slip between steel tubular and infilled concrete effectively. The specimens show stable hysteresis behavior.
Key Words
    axial force ratio; column base joint; cyclic loading test; slip effect; ultrahigh-strength steel ba
Ben Mou, Zian Wang and Wanqiu Zhou:School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China

Qiyun Qiao:College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, P.R. Chin

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