Experimental study on circular steel tube-confined reinforced UHPC columns under axial loading

0559259 - ÚTAM 2023 RIV GB eng J - Journal Article
Wei, J. - Xie, Z. - Zhang, Wei - Luo, X. - Yang, Y. - Chen, B.
Experimental study on circular steel tube-confined reinforced UHPC columns under axial loading.
Engineering Structures. Roč. 230, March (2021), č. článku 111599. ISSN 0141-0296. E-ISSN 1873-7323
Institutional support: RVO:68378297
Keywords : ultrahigh-performance concrete (UHPC) * steel tube-confined reinforced UHPC (STCRU) * composite column * axial compression * bearing capacity
OECD category: Civil engineering
Impact factor: 5.582, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.engstruct.2020.111599

This paper investigates the compressive behavior of circular steel tube-confined reinforced ultrahighperformance concrete (UHPC) columns. An experiment was conducted consisting of axial loading applied to 18 stub columns (λ = 4L/D = 13), including steel tube-confined reinforced UHPC (STCRU) columns, steel tubeconfined UHPC (STCU) columns, UHPC-filled steel tube (UFST) columns, steel tube-confined reinforced concrete (STCRC) columns, and reinforced UHPC (RU) columns. The compressive behavior was also investigated by varying the addition of steel fibers. The failure mode of all the columns was shear failure except for the explosive failure of the RU columns without steel fibers and the drum-type failure of the STCRC columns. Interestingly, the addition of steel fibers greatly improved the strength and ductility of the RU columns. Finally, a reasonable formula for predicting the bearing capacity of STCRU columns was provided to overcome the application limits
of existing specifications, and the formula can describe the axial bearing capacity of stub STCRU columns better than other approaches.
Permanent Link: https://hdl.handle.net/11104/0332596