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.
- Conducted under sponsorhips of AREA Committee 7 - Wood Bridges and Trestles.
Chicago, IL United States 60616
- Publication Date: 1961-1
- Features: Figures; Tables;
- Pagination: 21 p.
- TRT Terms: Bridges; Load transfer; Loads; Stresses; Stringers; Wooden bridges
- Uncontrolled Terms: Loading
- Old TRIS Terms: Ballast deck bridges; Bridge stresses; Bridge stringers
- Subject Areas: Bridges and other structures; Railroads;
- 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