TY - JOUR

T1 - Non-constant biaxial bending capacity assessment of CFST columns through interaction diagrams

AU - Espinós, Ana

AU - Albero, Vicente

AU - Romero, Manuel L.

AU - Mund, Maximilian

AU - Meyer, Patrick

AU - Schaumann, Peter

N1 - Funding Information: The authors gratefully acknowledge ―Conselleria d‘Educació, Investigació, Cultura i Esport‖ of the Valencian Community (Spain) for funding the project GV/2017/026. The authors would also like to thank Leibniz Universität Hannover for providing the financial support of the research stay of Maximilian Mund at Universitat Politècnica de València.

PY - 2019/8/25

Y1 - 2019/8/25

N2 - 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.

AB - 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.

KW - Biaxial bending

KW - Concrete-filled steel tubular columns

KW - Eurocode 4

KW - Finite element analysis

KW - Non-constant bending moment

KW - Parametric studies

UR - http://www.scopus.com/inward/record.url?scp=85071670699&partnerID=8YFLogxK

U2 - 10.12989/scs.2019.32.4.521

DO - 10.12989/scs.2019.32.4.521

M3 - Article

AN - SCOPUS:85071670699

VL - 32

SP - 521

EP - 536

JO - Steel and Composite Structures

JF - Steel and Composite Structures

SN - 1229-9367

IS - 4

ER -