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Abstract:
The tests of composite concrete-filled square thin-walled steel tubular (CCSTWST) specimens under bending load were carried out. The effects of embedding hollow circular steel tube and embedding high-strength concrete filled circular steel tube on the bending behavior of the pure bending segment of the CCSTWST specimen were investigated. The test results indicate that embedding hollow circular steel tube and embedding high-strength concrete-filled circular steel tube can significantly enhance its flexural resistance, and the effect of the later is more obvious. The strength and stiffness of a square CCSTWST is obviously higher than the pure steel tubular counterpart. During the whole testing process, no failure at the corner of the outer steel tube can be found. The FE analysis of the flexural behavior of composite CCSTWST beams were then conducted. The predicted results agreed well with the measured results. The compressive strength of the sandwiched concrete at the corner was effectively increased due to the confinement of the outer steel tube. The parameteric analysis indicates that the flexural resistance and stiffness of CCSTWST specimens are increased with the increase of the sandwiched concrete strength and the ratio of diameter to width. However, the flexural resistance and stiffness are decreased with the increase of the ratio of diameter to thickness. And the flexural resistance of CCSTWST specimens is increased with the increase of the steel yield strength. Finally, the simplified models were proposed to calculate flexural resistances of CCSTWST specimens with a hollow section or a solid section, which have a high accuracy. © 2017, Editorial Office of Journal of Building Structures. All right reserved.
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Journal of Building Structures
ISSN: 1000-6869
CN: 11-1931/TU
Year: 2017
Issue: 7
Volume: 38
Page: 78-84
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