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    Eccentrically loaded concrete encased steel composite columns

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    Publication date
    2011
    Author
    El-Lobody, E.
    Young, B.
    Lam, Dennis
    Keyword
    Concrete encased steel; Composite columns; Eccentrically loaded; Finite element; Modelling; High strength; Pin-ended; Structural design
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    This paper presents a nonlinear 3-D finite element model for eccentrically loaded concrete encased steel composite columns. The columns were pin-ended subjected to an eccentric load acting along the major axis, with eccentricity varied from 0.125 to 0.375 of the overall depth (D) of the column sections. The model accounted for the inelastic behaviour of steel, concrete, longitudinal and transverse reinforcement bars as well as the effect of concrete confinement of the concrete encased steel composite columns. The interface between the steel section and concrete, the longitudinal and transverse reinforcement bars, and the reinforcement bars and concrete were also considered allowing the bond behaviour to be modelled and the different components to retain its profile during the deformation of the column. The initial overall geometric imperfection was carefully incorporated in the model. The finite element model has been validated against existing test results. The concrete strengths varied from normal to high strength (30¿110 MPa). The steel section yield stresses also varied from normal to high strength (275¿690 MPa). Furthermore, the variables that influence the eccentrically loaded composite column behaviour and strength comprising different eccentricities, different column dimensions, different structural steel sizes, different concrete strengths, and different structural steel yield stresses were investigated in a parametric study. Generally, it is shown that the effect on the composite column strength owing to the increase in structural steel yield stress is significant for eccentrically loaded columns with small eccentricity of 0.125D. On the other hand, for columns with higher eccentricity 0.375D, the effect on the composite column strength due to the increase in structural steel yield stress is significant for columns with concrete strengths lower than 70 MPa. The strength of composite columns obtained from the finite element analysis were compared with the design strengths calculated using the Eurocode 4 for composite columns. Generally, it is shown that the EC4 accurately predicted the eccentrically loaded composite columns, while overestimated the moment.
    URI
    http://hdl.handle.net/10454/5920
    Version
    published version paper
    Citation
    El-Lobody, E., Young, B. and Lam, D. (2011). Eccentrically loaded concrete encased steel composite columns. Thin-Walled Structures. Vol. 49, No.1, pp. 53-65.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.tws.2010.08.006
    Type
    Article
    Collections
    Engineering and Informatics Publications

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