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.

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