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首页> 外文期刊>Steel & Composite Structures: An International Journal >Axial compression behavior of circular recycled concrete-filled steel tubular short columns reinforced by silica fume and steel fiber
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Axial compression behavior of circular recycled concrete-filled steel tubular short columns reinforced by silica fume and steel fiber

机译：二氧化硅烟气和钢纤维加固圆形再生混凝土钢管短柱的轴向压缩行为

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摘要

This paper presents an experimental work for short circular steel tube columns filled with normal concrete (NAC), recycled aggregate concrete (RAC), and RAC with silica fume and steel fiber. Ten specimens were tested under axial compression to research the effect of silica fume and steel fiber volume percentage on the behavior of recycled aggregate concrete-filled steel tube columns (RACFST). The failure modes, ultimate loads and axial load-strain relationships are presented. The test results indicate that silica fume and steel fiber would not change the failure mode of the RACFST column, but can increase the mechanical performances of the RACFST column because of the filling effect and pozzolanic action of silica fume and the confinement effect of steel fiber. The ultimate load, ductility and energy dissipation capacity of RACFST columns can exceed that of corresponding natural aggregate concrete-filled steel tube (NACFST) column. Design formulas EC4 for the load capacity NACFST and RACFST columns are proposed, and the predictions agree well with the experimental results from this study.
机译：本文为填充普通混凝土（NAC），再生骨料混凝土（RAC）的短圆形钢管柱进行实验工作，以及硅烟和钢纤维的RAC。在轴向压缩下进行十种标本，以研究二氧化硅烟气和钢纤维体积百分比对再生骨料混凝土钢管柱（RACFST）的行为的影响。呈现了故障模式，终极载荷和轴向载荷关系。试验结果表明，二氧化硅烟气和钢纤维不会改变RACFST柱的故障模式，但由于硅烟的灌注效果和钢纤维的限制效果，可以增加racFST柱的机械性能。 racFST柱的最终负载，延展性和能量耗散能力可能超过相应的天然骨料混凝土钢管（NACFST）柱。提出了用于负载能力NACFST和RACFST列的设计公式EC4，并且预测与本研究的实验结果很好。

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