Study on the mechanical properties of recycled concrete composite column reinforced with thin-wall steel tube and fiber reinforced plastic

Abstract

Abstract: To study the mechanical properties of fiber-reinforced polymer (FRP) reinforced thin-walled steel tube recycled concrete composite columns, axial compression tests were conducted on one reinforced concrete (RC) column and five FRP reinforced composite columns to investigate the effects of initial axial compression ratio, newly added recycled concrete strength, and FRP type on the failure mode and stress mechanism of the specimens.Important mechanical indicators such as bearing capacity, displacement, thin-walled steel tube strain, and FRP strain were measured.Based on the limit equilibrium theory, a calculation method for bearing capacity and ductility coefficient was proposed.The results indicate that increasing the initial axial compression ratio would continuously reduce the bearing capacity of the reinforced specimen.Improving the strength of recycled concrete can enhance the bearing capacity of reinforced specimens.The finite element simulation results are in good agreement with the experimental results, and the variation pattern of mechanical parameters is basically consistent.The calculation methods for bearing capacity and ductility coefficient proposed are in good agreement with experimental results, finite element calculation results, and relevant literature fitting results.The calculation model meets the relevant mechanical indicators of FRP reinforced thin-walled steel tube recycled concrete composite columns and meets the requirements of engineering structural reinforcement design.

Key words: FRP, recycled concrete, initial axial pressure ratio, thin-walled steel tube, limited-equilibrium theory

CLC Number:

TU377.9

CHEN Hua, GUAN Ji-wen, CHEN Yao-jia, YANG Jing-xiong. Study on the mechanical properties of recycled concrete composite column reinforced with thin-wall steel tube and fiber reinforced plastic[J]. Journal of Lanzhou University of Technology, 2026, 52(3): 120-130.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2026/V52/I3/120

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