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Shear strength of square concrete-filled steel tubular columns reinforced with internal steel stirrups
https://orcid.org/0000-0003-2852-6234
Highlights Shear tests on 35 square CFST columns with stirrups were conducted. Shear capacity is greater at a smaller shear span ratio, but tube strength varies little. Axial load increases the shear capacity of column but decreases tube’s shear strength. Stirrups and their distance to the tube contribute little to shear resistance. A method that adequately captures the respective shear contribution is proposed.
Abstract A concrete filled steel tubular (CFST) column internally reinforced with steel stirrups has significantly enhanced fire resistance over a conventional CFST column without stirrups. Resistance to shear may be a vital load case to be considered when designing CFST columns. However, there is comparatively little research into the shearing behaviors of CFST columns and the existing design equations do not adequately describe the contributions of different components to the total shear resistance. In this study, thirty-five square CFST columns, with and without stirrups were fabricated and tested to failure under combined shear load and axial compression. The portions of observed shear resistance contributed by the steel tube, concrete infill and stirrups were isolated. The concrete contained demolished concrete lumps (DCLs). The tube’s thickness, the ratio of shear span to depth, the axial load ratio, the replacement ratio of DCLs, the center-to-center spacing between stirrups, and the gap between steel tube and stirrups were varied in the experiments. The test results showed that: (1) the shear capacity was much greater at a smaller shear span-to-depth ratio, but the ratio had little effect on the contribution of the steel tube to shear resistance when ranging from 0.15 to 0.50; (2) the shear capacity gradually increased as the axial loading increased, but the shear contribution of the steel tube decreased; and (3) the internal stirrups contributed little to the shear resistance, and there was little difference in shear capacity as the gap between the stirrups and tube increased from 15 mm to 35 mm. A method to adequately capture the respective contribution of different components in the column was proposed. The new method generally gave more accurate predictions than the methods currently in use, and its predictions were generally conservative.
Shear strength of square concrete-filled steel tubular columns reinforced with internal steel stirrups
https://orcid.org/0000-0003-2852-6234
Highlights Shear tests on 35 square CFST columns with stirrups were conducted. Shear capacity is greater at a smaller shear span ratio, but tube strength varies little. Axial load increases the shear capacity of column but decreases tube’s shear strength. Stirrups and their distance to the tube contribute little to shear resistance. A method that adequately captures the respective shear contribution is proposed.
Abstract A concrete filled steel tubular (CFST) column internally reinforced with steel stirrups has significantly enhanced fire resistance over a conventional CFST column without stirrups. Resistance to shear may be a vital load case to be considered when designing CFST columns. However, there is comparatively little research into the shearing behaviors of CFST columns and the existing design equations do not adequately describe the contributions of different components to the total shear resistance. In this study, thirty-five square CFST columns, with and without stirrups were fabricated and tested to failure under combined shear load and axial compression. The portions of observed shear resistance contributed by the steel tube, concrete infill and stirrups were isolated. The concrete contained demolished concrete lumps (DCLs). The tube’s thickness, the ratio of shear span to depth, the axial load ratio, the replacement ratio of DCLs, the center-to-center spacing between stirrups, and the gap between steel tube and stirrups were varied in the experiments. The test results showed that: (1) the shear capacity was much greater at a smaller shear span-to-depth ratio, but the ratio had little effect on the contribution of the steel tube to shear resistance when ranging from 0.15 to 0.50; (2) the shear capacity gradually increased as the axial loading increased, but the shear contribution of the steel tube decreased; and (3) the internal stirrups contributed little to the shear resistance, and there was little difference in shear capacity as the gap between the stirrups and tube increased from 15 mm to 35 mm. A method to adequately capture the respective contribution of different components in the column was proposed. The new method generally gave more accurate predictions than the methods currently in use, and its predictions were generally conservative.
Shear strength of square concrete-filled steel tubular columns reinforced with internal steel stirrups
https://orcid.org/0000-0003-2852-6234
Highlights Shear tests on 35 square CFST columns with stirrups were conducted. Shear capacity is greater at a smaller shear span ratio, but tube strength varies little. Axial load increases the shear capacity of column but decreases tube’s shear strength. Stirrups and their distance to the tube contribute little to shear resistance. A method that adequately captures the respective shear contribution is proposed.
Abstract A concrete filled steel tubular (CFST) column internally reinforced with steel stirrups has significantly enhanced fire resistance over a conventional CFST column without stirrups. Resistance to shear may be a vital load case to be considered when designing CFST columns. However, there is comparatively little research into the shearing behaviors of CFST columns and the existing design equations do not adequately describe the contributions of different components to the total shear resistance. In this study, thirty-five square CFST columns, with and without stirrups were fabricated and tested to failure under combined shear load and axial compression. The portions of observed shear resistance contributed by the steel tube, concrete infill and stirrups were isolated. The concrete contained demolished concrete lumps (DCLs). The tube’s thickness, the ratio of shear span to depth, the axial load ratio, the replacement ratio of DCLs, the center-to-center spacing between stirrups, and the gap between steel tube and stirrups were varied in the experiments. The test results showed that: (1) the shear capacity was much greater at a smaller shear span-to-depth ratio, but the ratio had little effect on the contribution of the steel tube to shear resistance when ranging from 0.15 to 0.50; (2) the shear capacity gradually increased as the axial loading increased, but the shear contribution of the steel tube decreased; and (3) the internal stirrups contributed little to the shear resistance, and there was little difference in shear capacity as the gap between the stirrups and tube increased from 15 mm to 35 mm. A method to adequately capture the respective contribution of different components in the column was proposed. The new method generally gave more accurate predictions than the methods currently in use, and its predictions were generally conservative.
Shear strength of square concrete-filled steel tubular columns reinforced with internal steel stirrups
Zang, Jian-Bo (author) / Wu, Bo (author)
Engineering Structures ; 284
2023-03-08
Article (Journal)
Electronic Resource
English
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