Behavior and Strength of Circular Hydraulic Cement Concrete-Filled Steel Tube Columns
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Abstract
This paper aimed to study the axial load behaviors and failure modes of circular hydraulic cement concrete-filled steel tube columns (HCFT column) under concentrically axial load and to compare the maximum compressive loads obtained from the experiment with those calculated by using the AISC-LRFD composite column design equations in order to check the adequacy of the equation. In this study, a total of 24 circular column specimens was tested. The dimension of the specimens is 150 mm in diameter and 750 mm in height. Two different cement types, hydraulic cement (HC) and ordinary Portland cement (OPC), were used to produce the concrete with the targeted ultimate compressive strength of 18 MPa. From the tests, it was found that the HCFT columns had a linear elastic behavior up to approximately 80-90% of their maximum compressive loads. After that, the behavior of the columns was nonlinear until their failure. This nonlinear behavior can be classified as the strain-softening type. The mode of failure of the HCFT columns was in a form of cracking and crushing of the concrete core and local buckling of the hollow steel tube. Additionally, it was found that the AISC-LRFD composite column design equation is reliable for estimating the maximum compressive load of the HCFT columns. Finally, by comparing the efficiency of the hydraulic cement versus the ordinary Portland cement for the concrete-filled steel tube column used in this study, it can be concluded that the hydraulic cement can be used as a substitute material for the ordinary Portland cement.
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