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Steel and Composite Structures
  Volume 32, Number 4, August25 2019, pages 521-536

Non-constant biaxial bending capacity assessment of CFST columns through interaction diagrams
Ana Espinós, Vicente Albero, Manuel L. Romero, Maximilian Mund, Patrick Meyer and Peter Schaumann

    The mechanical response of concrete-filled steel tubular (CFST) columns subjected to pure compression or uniaxial bending was studied in depth over the last decades. However, the available research results on CFST columns under biaxial bending are still scarce and the lack of experimental tests for this loading situation is evident. At the same time, the design provisions in Eurocode 4 Part 1.1 for verifying the stability of CFST columns under biaxial bending make use of a simplistic interaction curve, which needs to be revised. This paper presents the outcome of a numerical investigation on slender CFST columns subjected to biaxial bending. Eccentricities differing in minor and major axis, as well as varying end moment ratios are considered in the numerical model. A parametric study is conducted for assessing the current design guidelines of EN1994-1-1. Different aspect ratios, member slenderness, reinforcement ratios and load eccentricities are studied, covering both constant and variable bending moment distribution. The numerical results are subsequently compared to the design provisions of EN1994-1-1, showing that the current interaction equation results overly conservative. An alternative interaction equation is developed by the authors, leading to a more accurate yet conservative proposal.
Key Words
    biaxial bending; non-constant bending moment; concrete-filled steel tubular columns; finite element analysis; parametric studies; Eurocode 4
(1) Ana Espinós, Manuel L. Romero:
Instituto de Ciencia y Tecnología del Hormigón (ICITECH), Universitat Politècnica de València, Valencia, Spain;
(2) Vicente Albero:
Department of Mechanical Engineering and Construction, Universitat Jaume I, Castellón, Spain;
(3) Maximilian Mund, Patrick Meyer, Peter Schaumann:
Institute for Steel Construction, Leibniz Universitaet Hannover, Germany.

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