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Size effect of circular concrete-filled steel tubular short columns subjected to axial compression
AbstractIn this paper, thirty-six short columns with different diameters (150mm ≤ d ≤ 460mm) and steel ratios (4.0% ≤ α ≤ 10.0%) were tested to failure to investigate the size effect of circular concrete-filled steel tubular short columns subjected to axial compression. Size effects on the peak axial stress, peak axial strain, composite elastic modulus, and ductility coefficient were studied. The experimental results showed that the peak axial stress, peak axial strain and ductility coefficient of the specimens tended to decrease with the increase in the column diameter. The values of the composite elastic modulus remained almost constant when the diameter of the specimens increased, indicating that size effect on the composite elastic modulus was not obvious. Meanwhile, size effect on the peak axial stress was influenced by the steel ratio in the range of 4–10%. Furthermore, the size effect tended to decrease as the steel ratio increased. By comparing with the current codes, a reduction coefficient was introduced to consider the size effect of concrete core. Based on the reduction coefficient, the size effect of the concrete core inside the steel tube is found to be weaker compared with that of the unconfined concrete columns because of the confinement effect.
HighlightsIncrease of specimen size results in a decrease of peak axial stress and peak axial strain.Size effect on peak axial stress is influenced by steel ratio.Size effect of the concrete core reduces compared with that of the unconfined concrete columns because of the confinement effect.The influence of size effect on CFST columns can be well predicted by introducing a coefficient proposed in this paper.
Size effect of circular concrete-filled steel tubular short columns subjected to axial compression
AbstractIn this paper, thirty-six short columns with different diameters (150mm ≤ d ≤ 460mm) and steel ratios (4.0% ≤ α ≤ 10.0%) were tested to failure to investigate the size effect of circular concrete-filled steel tubular short columns subjected to axial compression. Size effects on the peak axial stress, peak axial strain, composite elastic modulus, and ductility coefficient were studied. The experimental results showed that the peak axial stress, peak axial strain and ductility coefficient of the specimens tended to decrease with the increase in the column diameter. The values of the composite elastic modulus remained almost constant when the diameter of the specimens increased, indicating that size effect on the composite elastic modulus was not obvious. Meanwhile, size effect on the peak axial stress was influenced by the steel ratio in the range of 4–10%. Furthermore, the size effect tended to decrease as the steel ratio increased. By comparing with the current codes, a reduction coefficient was introduced to consider the size effect of concrete core. Based on the reduction coefficient, the size effect of the concrete core inside the steel tube is found to be weaker compared with that of the unconfined concrete columns because of the confinement effect.
HighlightsIncrease of specimen size results in a decrease of peak axial stress and peak axial strain.Size effect on peak axial stress is influenced by steel ratio.Size effect of the concrete core reduces compared with that of the unconfined concrete columns because of the confinement effect.The influence of size effect on CFST columns can be well predicted by introducing a coefficient proposed in this paper.
Size effect of circular concrete-filled steel tubular short columns subjected to axial compression
Wang, Yuyin (author) / Chen, Peng (author) / Liu, Changyong (author) / Zhang, Ying (author)
Thin-Walled Structures ; 120 ; 397-407
2017-09-09
11 pages
Article (Journal)
Electronic Resource
English
FRP-confined circular concrete-filled steel tubular columns under cyclic axial compression
| Online Contents | 2014