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A platform for research: civil engineering, architecture and urbanism
Research on mechanical behaviour of tapered concrete-filled double skin steel tubular members with large hollow ratio subjected to bending
Abstract This paper reports a study on the mechanical behaviour of tapered concrete-filled double skin steel tubular (CFDST) members under bending. A total of twelve specimens with diverse hollow ratios and shear span ratios were tested. The failure mode, the distribution of the deflection curves, the bending moment-curvature curves (M-φ), the longitudinal stress distribution of the cross-section and the strain were investigated, respectively, to understand the bending performance and working mechanism of the specimens. Meanwhile, the finite element (FE) models of tapered CFDST members were developed to investigate the flexural behaviour by ABAQUS software. Finally, the calculation method for predicting the flexural capacity of tapered CFDST members was proposed. The results show that tapered CFDST specimen fails in a very ductile manner and no tensile fracture is observed at the tension region. The maximum deflection of tapered CFDST members occurs at the 3/4L 0 section. Moreover, it is found that the flexural capacity is sensitive to the change of taper angle and hollow ratio due to the variation of flexure stiffness. For instance, ultimate bending capacity can be decreased by 62.6% when the taper angle changes from 0° to 1.71°. In addition, it is not reliable to directly select the minimum section of tapered CFDST members as designed section, which will underestimate the flexural capacity of the specimens. Therefore, the concept of equivalent section is proposed to predict the calculation, and the predicted results are satisfactorily in accordance with the measured results, which can provide certain reference for engineering design.
Graphical abstract Display Omitted
Highlights Twelve tapered CFDST specimens under bending are experimentally and numerically investigated. The influence of various factors on the deflection and flexural capacity is estimated. The effect of taper on failure position of tapered CFDST members is analyzed. The simplified formulae are proposed to predict the flexural capacity of tapered CFDST members.
Research on mechanical behaviour of tapered concrete-filled double skin steel tubular members with large hollow ratio subjected to bending
Abstract This paper reports a study on the mechanical behaviour of tapered concrete-filled double skin steel tubular (CFDST) members under bending. A total of twelve specimens with diverse hollow ratios and shear span ratios were tested. The failure mode, the distribution of the deflection curves, the bending moment-curvature curves (M-φ), the longitudinal stress distribution of the cross-section and the strain were investigated, respectively, to understand the bending performance and working mechanism of the specimens. Meanwhile, the finite element (FE) models of tapered CFDST members were developed to investigate the flexural behaviour by ABAQUS software. Finally, the calculation method for predicting the flexural capacity of tapered CFDST members was proposed. The results show that tapered CFDST specimen fails in a very ductile manner and no tensile fracture is observed at the tension region. The maximum deflection of tapered CFDST members occurs at the 3/4L 0 section. Moreover, it is found that the flexural capacity is sensitive to the change of taper angle and hollow ratio due to the variation of flexure stiffness. For instance, ultimate bending capacity can be decreased by 62.6% when the taper angle changes from 0° to 1.71°. In addition, it is not reliable to directly select the minimum section of tapered CFDST members as designed section, which will underestimate the flexural capacity of the specimens. Therefore, the concept of equivalent section is proposed to predict the calculation, and the predicted results are satisfactorily in accordance with the measured results, which can provide certain reference for engineering design.
Graphical abstract Display Omitted
Highlights Twelve tapered CFDST specimens under bending are experimentally and numerically investigated. The influence of various factors on the deflection and flexural capacity is estimated. The effect of taper on failure position of tapered CFDST members is analyzed. The simplified formulae are proposed to predict the flexural capacity of tapered CFDST members.
Research on mechanical behaviour of tapered concrete-filled double skin steel tubular members with large hollow ratio subjected to bending
Wang, Wen-Da (author) / Fan, Jia-Hao (author) / Shi, Yan-Li (author) / Xian, Wei (author)
2021-04-05
Article (Journal)
Electronic Resource
English
Behaviour of hollow concrete-filled steel tubular members subjected to tension and bending
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