Steel and Composite Structures

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Experimental and numerical investigation on exposed RCFST column-base Joint

  • Ben, Mou (School of Civil Engineering, Architecture and Environment, Hubei University of Technology) ;
  • Xingchen, Yan (School of Civil Engineering, Qingdao University of Technology) ;
  • Qiyun, Qiao (College of Architecture and Civil Engineering, Beijing University of Technology) ;
  • Wanqiu, Zhou (School of Civil Engineering, Qingdao University of Technology)
  • Received : 2020.10.28
  • Accepted : 2022.12.06
  • Published : 2022.12.10
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Abstract

This paper investigates the seismic performance of exposed RCFST column-base joints, 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 with different axial force ratios (n = 0, 0.25, and 0.5) were tested under cyclic loadings. Finite element analysis (FEA) models were validated in the basic indexes and failure mode. The hysteresis behavior of the exposed RCFST column-base joints was studied by the parametrical analysis including six parameters: width of column (D), width-thickness ratio (D/t), axial force ratio (n), shear-span ratio (L/D), steel tube strength (fy) and concrete strength (fc). The bending moment of the exposed RCFST column-base joint increased with D, fy and fc. But the D/t and L/D play a little effect on the bending capacity of the new column-base joint. Finally, the calculation formula is proposed to assess the bending moment capacities, and the accuracy and stability of the formula are verified.

Keywords

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