Advances in concrete construction

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Numerical analysis and eccentric bearing capacity of steel reinforced recycled concrete filled circular steel tube columns

  • Ma, Hui (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Liu, Fangda (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Wu, Yanan (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Cui, Hang (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Zhao, Yanli (Research and Design Institute of water conservancy and hydropower, Xi'an University of Technology)
  • Received : 2020.04.24
  • Accepted : 2022.02.18
  • Published : 2022.02.25
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Abstract

To study the mechanical properties of steel reinforced recycled concrete (SRRC) filled circular steel tube columns under eccentric compression loads, this study presents a finite element model which can simulate the eccentrically compressed columns using ABAQUS software. The analytical model was established by selecting the reasonable nonlinear analysis theory and the constitutive relationship of materials in the columns. The influences of design parameters on the eccentric compressive performance of columns were also considered in detail, such as the diameter-thickness ratio of circular steel tube, replacement percentage of recycled coarse aggregate (RCA), slenderness ratio, eccentricity, recycled aggregate concrete (RAC) strength and steel strength and so on. The deformation diagram, stress nephogram and load-displacement curves of the eccentrically compressed columns were obtained and compared with the test results of specimens. The results show that although there is a certain error between the calculation results and the test results, the error is small, which shows the rationality on the numerical model of eccentrically compressed columns. The failure of the columns is mainly due to the symmetrical bending of the columns towards the middle compression zone, which is a typical compression bending failure. The eccentric bearing capacity and deformation capacity of columns increase with the increase of the strength of steel tube and profile steel respectively. Compared with profile steel, the strength of steel tube has a greater influence on the eccentric compressive performance of columns. Improving the strength of RAC is beneficial to the eccentric bearing capacity of columns. In addition, the eccentric bearing capacity and deformation capacity of columns decrease with the increase of replacement percentage of RCA. The section form of profile steel has little influence on the eccentric compression performance of columns. On this basis, the calculation formulas on the nominal eccentric bearing capacity of columns were also put forward and the results calculated by the proposed formulas are in good agreement with the test values.

Keywords

Acknowledgement

The research was financially supported by the National Natural Science Foundation of China P.R. (No. 5140848), The Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (No. No. 2022JM-258, 2021JM-332), which is gratefully acknowledged.

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