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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Performance of the High-Strength Self-Stressing and Self-Compacting Concrete-Filled Steel Tube Columns Subjected to the Uniaxial Compression
AU - Xu, Lihua
AU - Zhou, Penghua
AU - Chi, Yin
AU - Huang, Le
AU - Ye, Jianqiao
AU - Yu, Min
N1 - The final publication is available at Springer via http://dx.doi.org/10.1007/s40999-017-0257-9
PY - 2018/9
Y1 - 2018/9
N2 - To improve the compactness of concrete and prevent the debonding between steel tube and concrete core, a high-strength self-stressing and self-compacting concrete-filled steel tube (HSS-CFST) column is introduced. This paper deals with an experimental study on the uniaxial compression of HSS-CFST. A total of 51 specimens subjected to axial compression were investigated. Important variables, including self-stress level, concrete strength, tube thickness, and length-to-diameter ratio, were studied. The failure modes, ultimate bearing capacity, and post-peak ductility were analyzed. The results showed that the use of HSS concrete in CFST yielded a better uniaxial compression performance in comparison with the conventional CFST specimens. An increase of 12.4% in ultimate bearing capacity was observed for an HSS-CFST specimen having a self-stress of 5 MPa. The improvement becomes more pronounced as the length-to-diameter ratio increases. Besides, increasing concrete strength can also contribute significantly to the ultimate bearing capacity, while improvement on the post-peak ductility is not obvious. Furthermore, a numerical analysis considering the self-stressing was carried out, which provided good agreement between the experimental results. Finally, predictive equations specially to calculate the ultimate bearing capacity of HSS-CFST columns were proposed and then validated by the experimental results.
AB - To improve the compactness of concrete and prevent the debonding between steel tube and concrete core, a high-strength self-stressing and self-compacting concrete-filled steel tube (HSS-CFST) column is introduced. This paper deals with an experimental study on the uniaxial compression of HSS-CFST. A total of 51 specimens subjected to axial compression were investigated. Important variables, including self-stress level, concrete strength, tube thickness, and length-to-diameter ratio, were studied. The failure modes, ultimate bearing capacity, and post-peak ductility were analyzed. The results showed that the use of HSS concrete in CFST yielded a better uniaxial compression performance in comparison with the conventional CFST specimens. An increase of 12.4% in ultimate bearing capacity was observed for an HSS-CFST specimen having a self-stress of 5 MPa. The improvement becomes more pronounced as the length-to-diameter ratio increases. Besides, increasing concrete strength can also contribute significantly to the ultimate bearing capacity, while improvement on the post-peak ductility is not obvious. Furthermore, a numerical analysis considering the self-stressing was carried out, which provided good agreement between the experimental results. Finally, predictive equations specially to calculate the ultimate bearing capacity of HSS-CFST columns were proposed and then validated by the experimental results.
KW - Uniaxial compression performance
KW - High strength
KW - Self-stress
KW - Concrete-filled steel tube
KW - SECTION STUB COLUMNS
KW - TUBULAR COLUMNS
KW - EXPERIMENTAL BEHAVIOR
KW - REINFORCED CONCRETE
KW - AXIAL LOAD
KW - CFST
KW - CAPACITY
U2 - 10.1007/s40999-017-0257-9
DO - 10.1007/s40999-017-0257-9
M3 - Journal article
VL - 16
SP - 1069
EP - 1083
JO - International journal of civil engineering
JF - International journal of civil engineering
SN - 1735-0522
IS - 9A
ER -