Steel and Composite Structures

  • 제40권1호
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  • Pages.75-85
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  • 2021
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Behavior of hybrid CFST with FRP-confined UHPC core under axial compression

  • Tao, Yi (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Gu, Jin-Ben (College of Civil Engineering, Tongji University) ;
  • Chen, Jian-Fei (Department of Ocean Science and Engineering, Southern University of Science and Technology) ;
  • Feng, Peng (Department of Civil Engineering, Tsinghua University)
  • 투고 : 2019.09.10
  • 심사 : 2021.06.17
  • 발행 : 2021.07.10
⟨ 이전 논문 다음 논문 ⟩

초록

A fiber-reinforced polymer (FRP)-confined concrete core that provides high strength and ductility under axial compression can act as strength enhancement in a hybrid column. In the present study, ordinary concrete was replaced with ultra-high-performance concrete (UHPC) to form an FRP-confined UHPC core (FCUC). The FCUC was embedded in square concrete-filled steel tube (CFST) columns to form a high-performance hybrid column (SCF-UHPC column for short). The axial compressive behavior of the SCF-UHPC was experimentally investigated using 12 SCF-UHPC columns and two ordinary CFST columns for comparison. The advantages of the SCF-UHPC include excellent axial load-bearing capacity, good ductility, and stable residual load-bearing capacity. The results show that failure of an SCF-UHPC column was caused by FRP rupture of FCUC, which occurred after steel tube buckling that results in the degraded stiffness. It was also shown that the load-displacement behavior of the SCF-UHPC composite column was determined by the UHPC core diameter and the corresponding confinement provided by the outer steel tube and inner FRP jacket. A hardening effect could be achieved when the confinement demand of the UHPC core was satisfied, whereas a plateau effect appeared if the confinement was insufficient. Furthermore, the load-bearing capacity and ductility of the SCF-UHPC columns improved with increased thickness of the steel tube and the FRP.

키워드

과제정보

The research presented in this paper was supported by the National Key R&D Program of China (2017YFC0703004), the National Natural Science Foundation of China (51978567) and ShaanXi Natural Science Foundation (2018JM5074).

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