INELASTIC LATERAL BUCKLING OF DETERMINATE BEAMS

Present methods for the design of laterally unbraced steel I-beams are reviewed, and the need for improvements in the treatment of beams of intermediate slenderness is demonstrated. A simple method, which makes due allowance for the type of loading, of estimating the inelastic buckling load of a single span beam is proposed. A design curve is proposed which makes use of the fully plastic moment and either the elastic or the inelastic critical moment. The position of this curve is determined by using available test data. This approach is more consistent than previous methods, particularly in the inelastic range where better allowance is made for the type of loading. A method of dealing with the interaction between adjacent segments of laterally continuous beams that buckle in the inelastic range is also proposed. Comparisons show that the method gives conservative results that are more accurate than those of existing approximate methods.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Nethercot, D A
  • Trahair, N S
• Publication Date: 1976-4

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 701-717
• Serial:
  • Journal of the Structural Division
  • Volume: 102
  • Issue Number: ST4
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Buckling; Inelastic stress; Loads; Structural design
• Uncontrolled Terms: Inelastic action; Loading; Steel beams
• Old TRIS Terms: Lateral movement
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00139274
• Record Type: Publication
• Report/Paper Numbers: ASCE #12020
• Files: TRIS
• Created Date: Sep 16 1976 12:00AM