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Tests and analysis on circular UHPFRC-filled steel tubular stub columns under eccentric compression
Abstract This paper developed the circular ultra-high performance fiber-reinforced concrete (UHPFRC)-filled steel tubular stub columns (CUFTSCs) for buildings and bridge piers. Eccentric-compression behaviours of CUFTSCs were studied through a 16-test program, and the studied key influencing parameters were eccentricity ratio (e/r = 0.0, 0.30, 0.68, and 0.98) and thickness of steel tube (t s). Under eccentric compression, the CUFTSCs failed in flexure-governed mode and exhibited linear, nonlinear, and recession working stages. The nonlinearities of CUFTSCs under eccentric compression were mainly contributed by nonlinear mechanical behaviours of compression steel tube and UHPFRC and minor steel-tube local buckling. UHPFRC crushing and major steel-tube local buckling occurred to the peak load point and recession branch of N-Δ/N-δ curves of CUFTSCs, respectively. As the eccentricity ratio increases the failure mode of CUFTSCs gradually changed from the compression-governed mode to flexural-bending-governed mode. The ductility of CUFTSCs is significantly improved through using thick steel tube. The code equations in EC4, AISC and GB50936 were conservative on predicting N u-M u interaction curves of CUFTSCs due to the ignorance of tensile strength of UHPFRC. The developed analytical models offer the most accurate estimations on N u-M u interaction curves of CUFTSCs.
Graphical abstract Display Omitted
Highlights N-M interaction behaviours of stub CFST columns with UHPC were studied. CUFTSCs at eccentric loads fail in UHPC crushing, yielding and local buckling of steel tube. The ductility of CUFTSCs is significantly improved through using thick steel tube. Developed analytical models predict well N-M interaction behaviours of CUFTSCs.
Tests and analysis on circular UHPFRC-filled steel tubular stub columns under eccentric compression
Abstract This paper developed the circular ultra-high performance fiber-reinforced concrete (UHPFRC)-filled steel tubular stub columns (CUFTSCs) for buildings and bridge piers. Eccentric-compression behaviours of CUFTSCs were studied through a 16-test program, and the studied key influencing parameters were eccentricity ratio (e/r = 0.0, 0.30, 0.68, and 0.98) and thickness of steel tube (t s). Under eccentric compression, the CUFTSCs failed in flexure-governed mode and exhibited linear, nonlinear, and recession working stages. The nonlinearities of CUFTSCs under eccentric compression were mainly contributed by nonlinear mechanical behaviours of compression steel tube and UHPFRC and minor steel-tube local buckling. UHPFRC crushing and major steel-tube local buckling occurred to the peak load point and recession branch of N-Δ/N-δ curves of CUFTSCs, respectively. As the eccentricity ratio increases the failure mode of CUFTSCs gradually changed from the compression-governed mode to flexural-bending-governed mode. The ductility of CUFTSCs is significantly improved through using thick steel tube. The code equations in EC4, AISC and GB50936 were conservative on predicting N u-M u interaction curves of CUFTSCs due to the ignorance of tensile strength of UHPFRC. The developed analytical models offer the most accurate estimations on N u-M u interaction curves of CUFTSCs.
Graphical abstract Display Omitted
Highlights N-M interaction behaviours of stub CFST columns with UHPC were studied. CUFTSCs at eccentric loads fail in UHPC crushing, yielding and local buckling of steel tube. The ductility of CUFTSCs is significantly improved through using thick steel tube. Developed analytical models predict well N-M interaction behaviours of CUFTSCs.
Tests and analysis on circular UHPFRC-filled steel tubular stub columns under eccentric compression
Yan, Jia-Bao (author) / Chen, Anzhen (author) / Zhu, Jin-Song (author)
2020-12-21
Article (Journal)
Electronic Resource
English
CFST columns , UHPC , Compression tests , <italic>N-M</italic> interaction , Eccentric compression , Design methods , AMs , analytical models , CFT , Concrete-filled steel tubular , CUFTSCs , circular UHPFRC-filled steel tubular stub columns , <italic>DI</italic> , ductility index , HSC , high strength concrete , LB , local buckling , LVDTS , linear variable displacement transducers , NWC , normal weight concrete , ultra-high performance concrete , UHPFRC , ultra-high performance fiber-reinforced concrete , UFST-SCs , UHPFRC-filled square steel tubular stub columns , UFT , UHPC-filled steel tube
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