Axial Compression Performance of Rectangular Concrete- Filled Steel Tubular Columns Using Environmentally Friendly Hydraulic Cement
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Abstract
This paper focuses on the study of the axial load behavior and failure characteristics of rectangular concrete-filled steel tubular columns using hydraulic cement (HC-CFST columns) under concentric axial loading. The experimental specimens consisted of 36 rectangular columns, each measuring 150 x 75 mm in cross-sectional dimensions and 750 mm in height. The key variables examined in this study encompass the type of cement, the thickness of the steel tube, the ultimate compressive strength of the concrete, and curing time. Two distinct variants of cement, hydraulic cement and ordinary Portland cement, were employed at three different compressive strengths of 18, 25, and 32 MPa, with curing times of 28 and 90 days. Steel tubes were available in three thicknesses: 3.0, 4.5, and 6.0 mm. The compressive load was uniformly applied to the entire section and tested by progressively increasing the axial load until the column reached failure. According to the test results, the HC-CFST columns display linear elastic behavior up to almost 90 - 95 % of their maximum compressive loads, after which the behavior transforms nonlinear until failure. Cracking of the concrete core, as well as local buckling of the hollow steel tube, were observed as modes of failure in the HC-CFST columns. The PC-CFST columns demonstrated a maximum compressive load that was approximately 1 - 2 % higher than that of the HC-CFST column at 28 days of curing. Nevertheless, for 90 days, the HC-CFST columns exhibited a greater maximum compressive load compared to the PC-CFST column due to the presence of pozzolanic components in the HC-based concrete instead of clinker. In addition, it has been observed that the ACI design equations are capable of accurately predicting the maximum compressive load of the HC-CFST columns. (Cont)
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