LABORATORY INVESTIGATION TO DETERMINE STATIC AND REPEATED LOAD STRENGTH OF FULL-SIZE DOUGLAS FIR SOLID SAWN STRINGERS

This report contains a description and analysis of data recorded during the laboratory investigation of 24 full-size solid-sawn treated Douglas fir stringers at the Association of American Railroads and a description of certain physical properties as determined by the Forest Products Laboratory at Madison, Wisconsin. The purpose of the investigation was to determine the static and repeated load shear strength of the stringers and effect of load placement. A third of the stringers were loaded with the first load 1-1/2d stringer depths from the support, a third with the load 2-1/4d and the remaining third 3d from the support. The stringers were loaded in increments of the shear design load with load points 4 ft-8 in. apart. Design load was that which produced allowable design shear stress of 100 psi.

• Corporate Authors:

  Association of American Railroads Research Center

  3140 South Federal Street
  Chicago, IL  United States  60616
• Publication Date: 1967-1

Media Info

• Features: Figures; Photos; Tables;
• Pagination: 14 p.

Subject/Index Terms

• TRT Terms: Bridges; Shear strength; Stringers; Wooden bridges
• Old TRIS Terms: Bridge stringers
• Subject Areas: Bridges and other structures; Railroads;

Filing Info

• Accession Number: 00095707
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: ER-70
• Files: TRIS
• Created Date: Jul 15 1975 12:00AM