Structural Engineering and Mechanics

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Finite element analysis and axial bearing capacity of steel reinforced recycled concrete filled square steel tube columns

  • Dong, Jing (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Ma, Hui (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Zou, Changming (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Liu, Yunhe (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Huang, Chen (School of Civil Engineering and Architecture, Xi'an University of Technology)
  • Received : 2019.03.08
  • Accepted : 2019.05.07
  • Published : 2019.10.10
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Abstract

This paper presents a finite element model which can simulate the axial compression behavior of steel reinforced recycled concrete (SRRC) filled square steel tube columns using the ABAQUS software. The analytical model was established by selecting the reasonable nonlinear analysis theory and the constitutive relationship of material in the columns. The nonlinear analysis of failure modes, deformation characteristics, stress nephogram, and load-strain curves of columns under axial loads was performed in detail. Meanwhile, the influences of recycled coarse aggregate (RCA) replacement percentage, profile steel ratio, width thickness ratio of square steel tube, RAC strength and slenderness ratio on the axial compression behavior of columns were also analyzed carefully. It shows that the results of finite element analysis are in good agreement with the experimental results, which verifies the validity of the analytical model. The axial bearing capacity of columns decreased with the increase of RCA replacement percentage. While the increase of wall thickness of square steel tube, profile steel ratio and RAC strength were all beneficial to improve the bearing capacity of columns. Additionally, the parameter analysis of finite element analysis on the columns was also carried out by using the above numerical model. In general, the SRRC filled square steel tube columns have high bearing capacity and good deformation ability. On the basis of the above analysis, a modified formula based on the American ANSI/AISC 360-10 was proposed to calculate the nominal axial bearing capacity of the columns under axial loads. The research conclusions can provide some references for the engineering application of this kind of columns.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Xi'an University of Technology

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