Structural Engineering and Mechanics

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Hysteretic behaviors and calculation model of steel reinforced recycled concrete filled circular steel tube columns

  • Ma, Hui (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology) ;
  • Zhang, Guoheng (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology) ;
  • Xin, A. (Qinghai Building and Materials Research Co., Ltd.) ;
  • Bai, Hengyu (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology)
  • Received : 2021.06.15
  • Accepted : 2022.03.15
  • Published : 2022.08.10
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Abstract

To realize the recycling utilization of waste concrete and alleviate the shortage of resources, 11 specimens of steel reinforced recycled concrete (SRRC) filled circular steel tube columns were designed and manufactured in this study, and the cyclic loading tests on the specimens of columns were also carried out respectively. The hysteretic curves, skeleton curves and performance indicators of columns were obtained and analysed in detail. Besides, the finite element model of columns was established through OpenSees software, which considered the adverse effect of recycled coarse aggregate (RA) replacement rates and the constraint effect of circular steel tube on internal RAC. The numerical calculation curves of columns are in good agreement with the experimental curves, which shows that the numerical model is relatively reasonable. On this basis, a series of nonlinear parameters analysis on the hysteretic behaviors of columns were also investigated. The results are as follows: When the replacement rates of RA increases from 0 to 100%, the peak loads of columns decreases by 7.78% and the ductility decreases slightly. With the increase of axial compression ratio, the bearing capacity of columns increases first and then decreases, but the ductility of columns decreases rapidly. Increasing the wall thickness of circular steel tube is very profitable to improve the bearing capacity and ductility of columns. When the section steel ratio increases from 5.54% to 9.99%, although the bearing capacity of columns is improved, it has no obvious contribution to improve the ductility of columns. With the decrease of shear span ratio, the bearing capacity of columns increases obviously, but the ductility decreases, and the failure mode of columns develops into brittle shear failure. Therefore, in the engineering design of columns, the situation of small shear span ratio (i.e., short columns) should be avoided as far as possible. Based on this, the calculation model on the skeleton curves of columns was established by the theoretical analysis and fitting method, so as to determine the main characteristic points in the model. The effectiveness of skeleton curve model is verified by comparing with the test skeleton curves.

Keywords

Acknowledgement

The research was financially supported by National Natural Science Foundation of China P.R. (No.51408485), Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (No.2022JM-258 and No. 2021JM-332), the Open Fund Project of Qinghai Provincial Key Laboratory of Plateau Green Building and Ecocommunity (KLKF-2021-001), which is gratefully acknowledged.

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