INVESTIGATION OF FATIGUE AND STATIC STRENGTH OF 50 YEAR OLD TIMBER STRINGERS FROM A.T. AND S.F. RY. BRIDGE NEAR LA JUNTA, COLORADO

The report contains a description and analysis of data obtained during the test of a three-span creosoted timber ballast-deck trestle. Information was desired on 50-year old stringers in order to correlate field loading conditions with future laboratory research. Since Bridge 589.6 was to be replaced with a concrete culvert in the near future making the old stringers available for laboratory tests, it was decided to conduct a field test. The significant results of the test were that the maximum recorded strain at the center line of either test span was 357 micro inches/inch on the bottom of stringer 3 at the center line of span, and the maximum recorded strain over the center line of bent was 420 micro inches/inches on the top of stringer 7. These strains are equivalent to stresses of 714 psi and 840 psi, respectively, based on an assumed modulus of elasticity of 2,000 psi.

  • Supplemental Notes:
    • Conducted under sponsorhips of AREA Committee 7 - Wood Bridges and Trestles.
  • Corporate Authors:

    Association of American Railroads Research Center

    3140 South Federal Street
    Chicago, IL  United States  60616
  • Publication Date: 1961-1

Media Info

  • Features: Figures; Tables;
  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00097264
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: ER-2
  • Files: TRIS
  • Created Date: Jul 29 1975 12:00AM