Earthquakes and Structures

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The seismic performance of steel pipe-aeolian sand recycled concrete columns

  • Yaohong Wang (School of Civil Engineering, Inner Mongolia University of Technology) ;
  • Kangjie Chen (School of Civil Engineering, Inner Mongolia University of Technology) ;
  • Zhiqiang Li (School of Water Conservancy and Construction Engineering, Shihezi University) ;
  • Wei Dong (Civil Engineering, Inner Mongolia University of Science and Technology College of Engineering) ;
  • Bin Wu (Key Laboratory of Civil Engineering Structure and Mechanics of Inner Mongolia Autonomous Region)
  • Received : 2023.10.15
  • Accepted : 2023.12.21
  • Published : 2024.01.25
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Abstract

To investigate the seismic performance of steel pipe-aeolian sand recycled concrete columns, this study designed and produced five specimens. Low-cycle repeated load tests were conducted while maintaining a constant axial compression ratio. The experiment aimed to examine the impact of different aeolian sand replacement rates on the seismic performance of these columns. The test results revealed that the mechanical failure modes of the steel pipe-recycled concrete column and the steel pipe-aeolian sand recycled concrete column were similar. Plastic hinges formed and developed at the column foot, and severe local buckling occurred at the bottom of the steel pipe. Interestingly, the bulging height of the damaged steel pipe was reduced for the specimen mixed with an appropriate amount of wind-deposited sand under the same lateral displacement. The hysteresis curves of all five specimens tested were relatively full, with no significant pinching phenomenon observed. Moreover, compared to steel tube-recycled concrete columns, the steel tube-aeolian sand recycled concrete columns exhibited improved seismic energy dissipation capacity and ductility. However, it was noted that as the aeolian sand replacement rate increased, the bearing capacity of the specimen increased first and then decreased. The seismic performance of the specimen was relatively optimal when the aeolian sand replacement rate was 30%. Upon analysis and comparison, the damage analysis model based on stiffness and energy consumption showed good agreement with the test results and proved suitable for evaluating the damage degree of steel pipe-wind-sand recycled concrete structures.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (51868059); Inner Mongolia Natural Science Foundation (2021MS05022); Basic Scientific Research Expenses Program of Universities directly under Inner Mongolia Autonomous Region (JY20220005).

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