Experimental investigation of axially loaded steel fiber reinforced high strength concrete-filled steel tube columns
来源期刊：中南大学学报(英文版)2015年第6期
论文作者：LU Yi-yan LI Na LI Shan LIANG Hong-jun
文章页码：2287 - 2296
Key words：concrete-filled steel tube (CFST) columns; steel fiber; high strength concrete; axial load; ductility; load capacity
Abstract: an experimental study on the compressive behavior of steel fiber reinforced concrete-filled steel tube columns is presented. specimens were tested to investigate the effects of the concrete strength, the thickness of steel tube and the steel fiber volume fraction on the ultimate strength and the ductility. The experimental results indicate that the addition of steel fibers in concrete can significantly improve the ductility and the energy dissipation capacity of the concrete-filled steel tube columns and delay the local buckling of the steel tube, but has no obvious effect on the failure mode. It has also been found that the addition of steel fibers is a more effective method than using thicker steel tube in enhancing the ductility, and more advantageous in the case of higher strength concrete. An analytical model to estimate the load capacity is proposed for steel tube columns filled with both plain concrete and steel fiber reinforced concrete. The predicted results are in good agreement with the experimental ones obtained in this work and literatures.
LU Yi-yan(卢亦焱), LI Na(李娜), LI Shan(李杉), LIANG Hong-jun(梁鸿骏)
(School of Civil Engineering, Wuhan University, Wuhan 430072, China)
Abstract:an experimental study on the compressive behavior of steel fiber reinforced concrete-filled steel tube columns is presented. specimens were tested to investigate the effects of the concrete strength, the thickness of steel tube and the steel fiber volume fraction on the ultimate strength and the ductility. The experimental results indicate that the addition of steel fibers in concrete can significantly improve the ductility and the energy dissipation capacity of the concrete-filled steel tube columns and delay the local buckling of the steel tube, but has no obvious effect on the failure mode. It has also been found that the addition of steel fibers is a more effective method than using thicker steel tube in enhancing the ductility, and more advantageous in the case of higher strength concrete. An analytical model to estimate the load capacity is proposed for steel tube columns filled with both plain concrete and steel fiber reinforced concrete. The predicted results are in good agreement with the experimental ones obtained in this work and literatures.
Key words:concrete-filled steel tube (CFST) columns; steel fiber; high strength concrete; axial load; ductility; load capacity
