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Nonlinear analysis of circular concrete-filled steel tubular short columns under axial loading

Liang, Qing ORCID: 0000-0003-0333-2265 and Fragomeni, Sam (2009) Nonlinear analysis of circular concrete-filled steel tubular short columns under axial loading. Journal of Constructional Steel Research, 65 (12). pp. 2186-2196. ISSN 0143-974X

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The confinement effect provided by the steel tube in a circular concrete-filled steel tubular (CFST) short column remarkably increases the strength and ductility of the concrete core. The reliable prediction using nonlinear analysis methods for circular CFST columns relies on the use of accurate models for confined concrete. In this paper, accurate constitutive models for normal and high strength concrete confined by either normal or high strength circular steel tubes are proposed. A generic fiber element model that incorporates the proposed constitutive models of confined concrete is created for simulating the nonlinear inelastic behavior of circular CFST short columns under axial loading. The generic fiber element model developed is verified by comparisons of computational results with existing experimental data. Extensive parametric studies are conducted to examine the accuracy of various confining pressure models and the effects of the tube diameter-to-thickness ratio, concrete compressive strengths and steel yield strengths on the fundamental behavior of circular CFST columns. A new design formula accounting for concrete confinement effects is also proposed for circular CFST columns. It is demonstrated that the generic fiber element model and design formula adequately predict the ultimate strength and behavior of axially loaded circular CFST columns and can be used in the design of normal and high strength circular CFST columns.

Item Type: Article
Uncontrolled Keywords: ResPubID17324, concrete-filled steel tubes, composite columns, ductility, fiber element analysis, nonlinear analysis, strength
Subjects: Historical > Faculty/School/Research Centre/Department > School of Engineering and Science
Current > FOR Classification > 0905 Civil Engineering
Historical > SEO Classification > 8702 Construction Design
Depositing User: VUIR
Date Deposited: 03 May 2012 02:13
Last Modified: 20 Mar 2019 05:32
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Citations in Scopus: 126 - View on Scopus

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