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Performance of Concrete-Filled Steel Columns Under Eccentric Loading


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Abstract


This paper presents a 3D finite element model for the nonlinear inelastic analysis of concrete-filled tubular (CFT) columns under eccentric loading. Material constitutive relationships for concrete core confined by steel tube are incorporated in the model to account for the confinement effects that increase both the strength and ductility of concrete. The predicted ultimate capacities and complete load-displacement responses of CFT columns under eccentric loading are compared with both the experimental results available in the literature and the design code provisions to examine the accuracy of the finite element model utilized. The fundamental behavior of eccentric CFT columns with various width-to-thickness ratios, length-to-width, and values and locations of eccentricities is studied using the verified finite element model. Based on the extensive numerical studies, interaction curves of ultimate capacities between the axial force and the uni-axial moment are presented. The interaction curves developed are shown to be an effective and easily design tool for the nonlinear inelastic behavior of CFT columns under eccentric loading.
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Keywords


Concrete-Filled Steel Columns; Concrete; Eccentric Loading; Finite Element Method; Steel

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References


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