Compressive behavior of T-shaped concrete filled steel tubular columns |
| |
Authors: | Yuanlong Yang Hua Yang Sumei Zhang |
| |
Affiliation: | (1) School of Civil and Environmental Engineering, Nanyang Technological University, BLK N1, #1A-37, Nanyang Avenue, 639798 Singapore, Singapore;(2) School of Civil Engineering, Chang’an University, Xi’an, 710061, People’s Republic of China; |
| |
Abstract: | Special-shaped column structures improve residential architectural space, compared with traditional frame structures. However,
in respect to applicable building height and seismic fortification intensity, traditional special-shaped reinforced concrete
(RC) columns have strict limitations in seismic behavior, which hampers further generalization and application of special-shaped
columns. Due to increase in constraint effect for concrete, special-shaped concrete-filled steel tube (CFST) columns are expected
to behave advantages on the strength, ductility and seismic behavior over special-shaped RC columns. However, special attention
should be paid to prevent the steel plates’ premature local buckling and the separation between steel tube and concrete at
inner corners. The battlement-shaped bar stiffeners and tensile bar stiffeners, welded on tube surfaces, were first put forward
in this paper. Experimental study of 9 stubs in three groups subjected to axial loads was conducted, and the specimens consist
of 3 square stubs (including 1 non-stiffened and 2 stiffened CFST specimens) and 6 T-shaped stubs (including 1 RC specimen,
2 non-stiffened and 3 stiffened CFST specimens). Failure modes and static properties of the specimens were investigated. Experimental
results reveal that: Due to the constraint effect provided by T-shaped tubes, the CFST specimens behave advantages on the
RC specimen in the ascending stiffness, peak resistance and ductility (except for the battlement-shaped bar stiffened CFSTs).
For square and T-shaped stiffened CFST specimens, the stiffeners improve their ductility, especially the tensile bar which
gives the best performance in ductility and improves the peak resistance substantially. The stiffeners postpone the buckling
of tubes, and even upgrade the classification of composite sections, without thickening the tubes. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|