Abstract

Plastic analysis according to Section III Appendix XIII-3230 may be used in lieu of satisfying primary stress limits. The associated definition of plastic collapse load is based on limiting the permanent plastic deformation to not exceed the elastic deformation using a method that is also used to determine the collapse load experimentally. The acceptable load is calculated from the collapse load using a reduction factor that depends on the Service Level. Using some simplified application examples, the strengths and weaknesses of the method are discussed relative to the objectives of primary stress limits. Proposals for modifications of the plastic analysis method in the Code are reviewed and assessed. Elements of a proposal for an updated version of Appendix XIII-3230 are discussed, including providing additional guidance for the computational implementation of the method. The representation of the material stress-strain curve is another important aspect that may require additional guidance.

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