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Plastic Design Requirements of the AISC Proposed LRFD Specification

by John A. Edinger, AISC, Chicago, IL, USA,
Geerhard Haaijer, AISC, Chicago, IL, USA,



Document Type: Proceeding Paper

Part of: Plastic and Other Limit State Methods for Design Evaluation

Abstract:

The American Institute of Steel Construction proposed LRFD Specification (1) has recently completed a one year period of trial use and review. This paper discusses the background of the plastic design requirements contained in the proposed LRFD Specification and compares them with the current Part 2 provisions. Because most designers are interested not only in the maximum load capacity but also in the behavior at service loads (elastic behavior) of a structure, plastic design has found limited use in the past. Using the LRFD method, the structural engineer considers directly the maximum load capacity of a structural member. This approach lends itself to plastic design methods where the complete behavior of a structure is considered. Several examples of new plastic design possibilities are presented.

Subject Headings: Load and resistance factor design | Plastic design | Load bearing capacity | Structural design | Structural behavior | Service loads | Allowable stress design

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