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Mechanical behavior of concrete filled steel tubular columns under axial compression

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Document pages: 15 pages

Abstract: The mechanical behavior of concrete filled steel tubular columns under axial compression is experimentally studied. There are two kinds of columns, including concrete-filled steel tubular column with foundation and column without foundation. Pure concrete column, reinforced concrete column and two kinds of steel pipe thickness are considered. The test results show that the reinforced concrete-filled steel tubular column has higher bearing capacity, more effective plastic behavior and greater toughness. When the load is about 0.4 ~ 0.5 times of the ultimate bearing capacity, the elastic-plastic boundary point appears. The change of rock socketed depth and the existence of steel pipe will affect the ultimate bearing capacity of rock socketed pile. Bearing capacity of pile rock-socketed CFST columns are lower than those of rock-socketed columns without a steel tube under a vertical load; besides, the greater the rock-socketed depth, the greater the bearing capacity of the rock-socketed piles. In addition, a numerical comparison between the ultimate load and the theoretical value calculated from the relevant specifications shows that the ultimate load is generally considerably greater than the theoretical calculation results.

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