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Axial compression performance of basalt-fiber-reinforced recycled-concrete-filled square steel tubular stub column

  • Zhang, Xianggang (School of Urban Construction, Wuchang University of Technology) ;
  • Gao, Xiang (School of Civil Engineering, Henan Polytechnic University) ;
  • Wang, Xingguo (School of Civil Engineering, Henan Polytechnic University) ;
  • Meng, Ercong (CET-College of Engineering and Technology, Southwest University) ;
  • Wang, Fang (School of Civil Engineering, Henan Polytechnic University)
  • Received : 2020.08.02
  • Accepted : 2020.11.05
  • Published : 2020.12.25

Abstract

This study aimed to inspect the axial compression mechanical performance of basalt-fiber-reinforced recycled - concrete (BFRRC)-filled square steel tubular stub column. The replacement ratio of recycled coarse aggregate (RCA) and the basalt fiber (BF) dosage were used as variation parameters, and the axial compression performance tests of 15 BFRRC-filled square steel tubular stub column specimens were conducted. The failure mode and the load-displacement/strain curve of the specimen were measured. The working process of the BFRRC-filled square steel tubular stub column was divided into three stages, namely, elastic-elastoplasticity, sudden drawdown, and plasticity. The influence of the design parameters on the peak bearing capacity, energy dissipation performance, and other axial compression performance indexes was discussed. A mathematical model of segmental stiffness degradation was proposed on the basis of the degradation law of combined secant-stiffness under axial compression. The full-process curve equation of axial compressive stress-strain was proposed by introducing the influencing factors, including the RCA replacement ratio and the BF dosage, and the calculated curve agreed well with the test-measured curve.

Keywords

Acknowledgement

Founding for this work was supported by the Fundamental Research Funds for the Universities of Henan Province (NSFRF200320, NSFRF200328), Key Scientific Research Project Plan for Colleges and Universities in Henan Province (20A560012), the Young Backbone Teachers Funding Scheme of Henan Polytechnic University (2019XQG-15).

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