ULTIMATE STATIC STRENGTH OF A 52-FT GLUED LAMINATED TIMBER GIRDER

Continuous oscillograph recordings of the extreme tensile and comprehensive fiber stresses at the center of a nine-inch by 36-inch by 52 foot laminated timber girder, the shears at one end of the span, and the deflection at the center of the span were discussed. The vertical deflection at the center of the span was determined by reading with a level a scale mounted on the beam. Four hydraulic jacks for applying the load and load measuring equipment were used. The ultimate load was 66,000 lb per jack, which is equivalant to a calculated flexural stress of 8510 psi. The measured deflection was 7.69 inches. Failure of this girder was associated with a rupture of the tensile fibers. There was also longitudinal cracking near the bottom of the girder with some of these cracks extending to one end.

• Corporate Authors:

  American Railway Engineering Association

  59 East Van Buren Street
  Chicago, IL  United States  60605
• Publication Date: 1960

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 601-608
• Serial:
  • AREA BULLETIN
  • Volume: 61
  • Publisher: American Railway Engineering Association

Subject/Index Terms

• TRT Terms: Bridges; Girders; Laminated wood; Stresses; Timber
• Subject Areas: Bridges and other structures; Railroads;

Filing Info

• Accession Number: 00052347
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Jul 15 1974 12:00AM