Reliability of Elasto-Plastic Structural Systems

by M. V. Delmar, Univ of Aalborg, Denmark,
J. D. Sørensen, Univ of Aalborg, Denmark,

Abstract: This paper proposes a method for generating safety margins and failure mode equations for elasto-plastic structures where interaction of load effects is taken into account. Structural failure is defined by large nodal displacements or plastic collapse. A branch-and-bound technique is used to identify the significant failure modes. For non-linear yield conditions equivalent linear models obtained by linearization of the yield function at the design point are used. A displacement based limit state is used where the deflections are determined using an incremental elasto-plastic analysis taking into account interaction of load effects and load path dependence.

Subject Headings: Failure analysis | Structural analysis | Structural reliability | Failure modes | Structural failures | System reliability | Structural systems | Elastoplasticity

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