The Present Status of Application of the Plastic Concepts in Structural Design

by Le-Wu Lu, Lehigh Univ, Fritz Engineering Lab, Bethlehem, PA, USA,

Document Type: Proceeding Paper

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


The different approaches of recognizing plastic behavior in the design of steel structures are reviewed and the design requirements that assure successful utilization of this behavior in practice are described. Partial recognition of plastic behavior is now an important part of the allowable-stress design provisions. Continuous beams and low-rise building frames are routinely designed by the plastic method, which represents a full recognition of plastic response. For the multistory frames, because of the effect of overall instability, design must be based on the stability limit load, not the plastic limit load. This complicates significantly the design process and may have affected wider adoption of the method. Inelastic behavior, however, is extensively utilized in the design of both low- and high-rise structures resisting seismic ground shaking. Some recent advances in this area are described.

Subject Headings: Steel structures | Plastic design | Structural design | Synthetic materials | Structural behavior | Plastics | Building design

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