Concrete Filled Steel Tube (CFST) has properties of both concrete and steel materials together, such as fire resistance, hardness, ductility, and high strength. For this reason, CFST has been of interest to many researchers due to the importance of CFST in the practical field in engineering reality. Twelve hollow CFST columns with a circular cross-section and 1000 mm in length consisting of two layers of steel were tested under various loads. The space between steel layers was filled with Self-Compacting Concrete (SCC). The columns were divided into three groups according to the type of loading, where two types of loads were applied concentric and eccentric. The results showed that the increased the arm (e) of the applied eccentric force, the greater the effect of the hole on the column. The effect of the opening was evident in decreasing the bearing strength of the column by (8, 11.2, 42.4) %, respectively, when the opening is at a distance (250,334,500) mm from the base of the column, respectively, concerning the columns loaded with a concentric image. Or for columns that were loaded at a distance of 508mm, the loading ratio decreased by (6.32, 18.95, 24.2) %, respectively, when the aperture is at a distance (250,334,500) mm, respectively, the load reduction ratio for bearing columns with an unfocused load at a distance of 101.6 was (16.67, 23.96, 39.58) %, respectively, when the opening is at a distance (250,334,500) mm, respectively.

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