EFFECT OF WARPING RESTRAINTS ON I-BEAM BUCKLING

Elastic lateral buckling moments are computed for six wide-flange beams under uniform moment for a comprehensive range of length to depth and depth to flange width ratios. Support conditions considered are fully fixed about the minor axis, hinged about the minor axis and free to warp, and hinged about the minor axis and warping suppressed. The last condition is reproduced in a prototype by welding a troughlike shape to the web and flanges in a manner that produced a warp restraining torque tube between the flanges. A numerical method is used to obtain buckling moments for the hinged-warp restrained case. The fixed-support condition is easily the superior way of suppressing buckling but that condition is often not easily producible in a practical design detail. On the other hand, the hinged-warped restrained support condition results in significant improvement in the buckling moments and has the advantage of being relatively easy to produce in a design detail. /Author/

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Ojalvo, M
  • Chambers, R S
• Publication Date: 1977-12

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 2351-60
• Serial:
  • Journal of the Structural Division
  • Volume: 102
  • Issue Number: ST12
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Buckling; Hinges; I beams; Strength of materials; Structural design; Torque; Warpage
• Old TRIS Terms: Warping /hinged joints/
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00172348
• Record Type: Publication
• Report/Paper Numbers: ASCE 13430 Proceeding
• Files: TRIS
• Created Date: Apr 26 1978 12:00AM