BENDING STRENGTH OF UNSYMMETRICAL PLATE GIRDERS

AN UNSYMMETRICAL PLATE GIRDER IS DEFINED AS A GIRDER WHOSE CENTROIDAL AXIS IS NOT AT THE MID-DEPTH OF THE WEB BECAUSE OF THE UNEQUAL AREAS OF THE FLANGES. THE ULTIMATE STATIC STRENGTH OF SUCH GIRDERS SUBJECTED TO PURE BENDING IS DETERMINED THEORETICALLY. THE ULTIMATE MOMENT IS ASSUMED TO CONSIST OF TWO CONTRIBUTIONS: THE GIRDER MOMENT BEFORE BUCKLING OF THE WEB AND THE GIRDER MOMENT CONTROLLED BY THE FLANGE STRENGTH REMAINING AFTER BUCKLING OF THE WEB. IN THE BUCKLING ANALYSIS, THE WEB PANEL IS ASSUMED TO BE FIXED AT THE FLANGES AND PINNED AT THE STIFFENERS. AFTER WEB BUCKLING, THE COMPRESSION PORTION OF THE WEB IS CONSIDERED AS BEING REPLACED WITH AN EFFECTIVE PLATE STRIP WHICH IS A PART OF THE COMPRESSION FLANGE. A GIRDER PANEL CAN REACH ITS ULTIMATE CAPACITY BEFORE OR AFTER BUCKLING OF THE WEB, BY THE FAILURE OF THE COMPRESSION FLANGE OR BY THE YIELDING OF THE TENSION FLANGE. THE METHOD IS APPLICABLE TO SYMMETRICAL AND UNSYMMETRICAL PLATE GIRDERS WITH A HOMOGENEOUS OR HYBRID CROSS SECTION. IT COMPARES WELL WITH THE AVAILABLE TEST RESULTS AND THUS PROVIDES A RELIABLE MEANS OF COMPUTING THE ULTIMATE STRENGTH OF TRANSVERSELY STIFFENED PLATE GIRDERS. /AUTHOR/

• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015

  Pennsylvania Department of Transportation

  1215 Transportation and Safety Building
  Harrisburg, PA  United States  17120

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Chern, C
  • Ostapenko, A
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Alternatives analysis; Bearing capacity; Bending; Bending moments; Buckling; Compressive strength; Cross sections; Flanges; Girders; Plate girders; Stiffeners (Plates); Tension; Theory; Transverse stiffeners; Ultimate strength; Webbing
• Old TRIS Terms: Flange strength; Stiffeners
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00215945
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: 66-3
• Files: TRIS, USDOT, STATEDOT
• Created Date: Mar 7 1971 12:00AM