Experimental study on the seismic performance of full-scale square CFST columns with different width-to-thickness ratios

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 1-9.

JIN Liu，LIANG Jian，CHEN Fengjuan，DU Xiuli

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Abstract

Six full-scale square concrete filled steel tubular (CFST) stub columns with the cross-sectional width of 800 mm were tested under constant axial loading and cyclic lateral loading. With the increase of the width-to-thickness ratios B/t of 50, 80 and 100, the influence of the confinement effect provided by steel tube to core concrete on the failure mode, hysteretic behavior, ductility, stiffness, and energy dissipation of the CFST columns was investigated. It can be found that 1) the failure mode of all specimens was the compression-flexural failure with the local buckling of steel tube and the crushing of core concrete at the bottom of the columns. 2) With the decrease of the width-to-thickness ratio (the confinement effect improved) the influence of the ductility of columns is not significant, and comparison with the scale columns, the ductility performance of the full-scale columns decreases obviously. 3) The effect of the width-to-thickness ratio on the stiffness degradation and energy dissipation of the full-scale columns is not significant, and with the decrease of width-to-thickness ratio, the cumulative energy of the specimen increases. 4) As the width-to-thickness ratio decreases with the increase of the confinement effect, the compression and flexural capacity increases, but the increased extent of the compression and flexural capacity is smaller than that of the current codes. In addition, according to the current design codes of China and Europe, the predicted values are large than that of experimental values of the full-scale CFST column. The calculated formulas in the code of America is very conservative.

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square CFST stocky column / confinement effect / width-to-thickness ratio / seismic performance / bearing capacity.

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JIN Liu，LIANG Jian，CHEN Fengjuan，DU Xiuli. Experimental study on the seismic performance of full-scale square CFST columns with different width-to-thickness ratios[J]. Journal of Vibration and Shock, 2023, 42(22): 1-9

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