Nonlinear analysis of short concrete-filled steel tubular beam-columns under axial load and biaxial bending

Article

Liang, Qing Quan. 2008. "Nonlinear analysis of short concrete-filled steel tubular beam-columns under axial load and biaxial bending." Journal of Constructional Steel Research. 64 (3), pp. 295-304. https://doi.org/10.1016/j.jcsr.2007.07.001
Article Title

Nonlinear analysis of short concrete-filled steel tubular beam-columns under axial load and biaxial bending

ERA Journal ID4225
Article CategoryArticle
Authors
AuthorLiang, Qing Quan
Journal TitleJournal of Constructional Steel Research
Journal Citation64 (3), pp. 295-304
Number of Pages10
Year2008
PublisherElsevier
Place of PublicationOxford, United Kingdom
ISSN0143-974X
1873-5983
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jcsr.2007.07.001
Web Address (URL)http://www.elsevier.com/wps/find/journaldescription.cws_home/405901/description#description
Abstract

This paper presents a nonlinear fiber element analysis method for determining the axial load-moment strength interaction diagrams for short concrete-filled steel tubular (CFST) beam-columns under axial load and biaxial bending. Nonlinear constitutive models for confined concrete and structural steel are considered in the fiber element analysis. Efficient secant algorithms are developed to iterate the depth and orientation of the neutral axis within a composite section to satisfy equilibrium conditions. The accuracy of the fiber element analysis program is verified by comparisons of fiber analysis results with experimental data and existing solutions. The fiber element analysis program developed is employed to study the effects of steel ratios, concrete strengths and steel yield strengths on axial load-moment interaction diagrams, the C-ratio and maximum ultimate moments of CFST beam-columns. The proposed fiber element analysis technique is shown to be efficient and accurate and can be used directly in the design of CFST beam-columns and in advanced analysis programs for the nonlinear analysis of composite columns and frames.

Keywordsbiaxial bending; composite columns; fiber element analysis; nonlinear analysis; strength
ANZSRC Field of Research 2020400505. Construction materials
400510. Structural engineering
490304. Optimisation
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Byline AffiliationsDepartment of Agricultural, Civil and Environmental Engineering
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