Plastic hinge development of frame members using a nonlinear hardening rule

T. Attard, A. Fafitis

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    A nonlinear hardening rule that defines a yield surface translation for homogeneous frame member materials is proposed. The rule is defined as a nonlinear constitutive relationship that examines material behavior through a postelastic perspective. The gradual development of the postelastic states of a beam along its length and through its section thickness is analyzed. The model uses a hardening index parameter to guide the nonlinear stress-strain relationship, and a smooth function to model the web-flange intersection of frame members. As such, nonlinear curvature distributions with continuous derivatives are determined along the length of the member, which enables lateral displacements to be accurately predicted. Plastic hinge lengths and finite-element displacements are subsequently determined, and a nonlinear stiffness is derived. The model is formulated on a constitutive level and applies a smoothed-over cross section to derive a single internal moment expression for any postelastic state. Results are verified through experimental published literature.

    Original languageEnglish (US)
    Pages (from-to)1286-1293
    Number of pages8
    JournalJournal of Structural Engineering
    Volume131
    Issue number8
    DOIs
    StatePublished - Aug 2005

    Fingerprint

    Hinges
    Hardening
    Plastics
    Flanges
    Stiffness
    Derivatives

    Keywords

    • Constitutive models
    • Degradation
    • Nonlinear response
    • Plastic deformation
    • Plastic hinges
    • Stress distribution
    • Stress strain relations

    ASJC Scopus subject areas

    • Building and Construction
    • Civil and Structural Engineering

    Cite this

    Plastic hinge development of frame members using a nonlinear hardening rule. / Attard, T.; Fafitis, A.

    In: Journal of Structural Engineering, Vol. 131, No. 8, 08.2005, p. 1286-1293.

    Research output: Contribution to journalArticle

    Attard, T. ; Fafitis, A. / Plastic hinge development of frame members using a nonlinear hardening rule. In: Journal of Structural Engineering. 2005 ; Vol. 131, No. 8. pp. 1286-1293.
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