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Abstract:
Experimental study and finite element analysis on four concrete-filled steel tubular (CFST) hybrid columns, as well as four CFST battened columns, were carried out with different eccentricity ratios. The failure process and modes were described, meanwhile the compressive capacity, load-deformation curves and load-strain curves were analyzed. Test results show that the failure mode of the axially loaded CFST hybrid column is due to the crushing of concrete and yielding of longitudinal bar in reinforced concrete (RC) plate, and the CFST member does not reach its ultimate resistance. The failure of the eccentrically-loaded CFST hybrid column is due to the local crushing of RC connection plates along with the buckling of steel tubes near the loading side, and the behaviors of CFST members are similar to those of CFST battened columns. Both the bearing capacity and initial compressive stiffness of CFST hybrid stub column are larger than those of CFST battened columns with the same eccentricity ratio. Due to the effect of shear transfer action of RC plate, the maximum bending deflection of the CFST hybrid stub column is smaller than that of CFST battened columns. The influence of eccentricity ratio on the ultimate load of CFST hybrid stub column is similar to CFST battened columns. The influence of eccentricity ratio on the ultimate load-carrying capacity of CFST hybrid stub column is similar to CFST battened columns. According to the test and finite element analysis results, the modified method of eccentricity ratio reduction coefficient on the bearing capacity of CFST hybrid stub columns is presented based on the method of CFST battened columns, and the calculated eccentricity ratio reduction coefficient matches the test results well. © 2016, 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: 2016
Issue: 5
Volume: 37
Page: 92-102
Cited Count:
SCOPUS Cited Count: 9
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 4
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