Abstract
In order to study the axial compression behavior of concrete-filled steel tubular (CFST) columns filled with high titanium slag, a total of 32 specimens, including normal CFST columns, half-high titanium slag CFST columns, and full-high titanium slag CFST columns, were used as experimental samples in this study. The axial compression behaviors of high titanium slag CFST columns and normal CFST columns with various parameters such as length–diameter ratio, strength grade of concrete, strength grade of steel tube, steel content ratio, etc., were evaluated and compared through axial compression testing under monotonic static loading. The results showed that the axial compressive behaviors of high titanium slag CFST columns with various length–diameter ratios were not significantly different from those of normal CFST columns, both of which showed good axial compression performance. In addition, the length–diameter ratio limit between short and medium long column was from 3.5 to 4.4. The length–diameter ratio was the main factor influencing the shape of load–deformation curve of CFST columns. The casing hoop coefficient also had a great influence on the bearing capacity of short columns, while the influence on that of middle and long columns was not obvious. In the end, the bearing capacities of all specimens were calculated by bearing capacity formulas in European EC4, American AISC360-10, and Chinese GB50936-2014 standards. The calculated values were in good agreement with the test results.
Highlights
The blast furnace slag produced by Panzhihua Iron and Steel Group Co., Ltd. during steel-making is called high titanium blast furnace slag or high titanium slag for short, because it contains more than20% TiO2 [1]
Li Xiaowei, Jiao Tao, and other scholars carried out an experimental study on the seismic performance of high titanium slag reinforced concrete (RC) columns [12,13,14,15,16], and the results showed that the seismic performance of high titanium slag concrete column was almost the same as that of normal concrete column
There was no significant difference between the axial compression performance of high titanium slag concrete-filled steel tubular (CFST) columns and normal CFST columns, regardless of column length
Summary
The blast furnace slag produced by Panzhihua Iron and Steel Group Co., Ltd. during steel-making is called high titanium blast furnace slag or high titanium slag for short, because it contains more than. It is necessary to carry out relevant experimental research on CFST columns filled with high titanium slag, which can provide the necessary theoretical basis for the application of high titanium slag concrete in steel–concrete composite structures. Pagoulatou et al carried out finite element analysis on the bearing capacity of CFST short column filled with concrete between double-layered circular steel tubes [35]. CFST members filled with high titanium slag have been widely used in the columns supports, trestle columns, subway station platform columns, power transmission and transformation of single-storey and multistorey industrial plants, equipment frame columns, various supports, poles, truss compression piles, space columns, structures, high-rise and super-high-rise buildings, trestle columns, subwaybars, station platform power transmission and transformation poles,and bridge structures, which have achieved good economic and social benefits. Study of CFST columns filled with high titanium slag concrete in this paper has practical significance
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