This report covers tests requested by the AAR Mechanical Division Committee on Loading Rules to study the radius at point of securement for steel strapping. Where high tension bands are used for hold down securement, the bands may be secured to the car in several different ways. The most common are through the stake pockets or to specially provided anchor pockets. Where these methods are not provided, or the load is of such design as to make these securement facilities impractical, steel bars or rods or steel bolts may be attached to the car to provide anchorage for the high tension bands. Whichever type of securement is used, Rule 16, of Section 1, of the General Rules covering the loading of Commodities on Open Top Cars, specifies that points where the bands contact the securement pocket must be rounded off or provided with metal fillers to protect the bands. To determine a minimum allowable radius they requested static and dynamic tests on radii up to 1/2 in. In the event of load shift the hold down strap will shift and the strap will be at some angle other than 90 degrees to the edge of the stake pocket or whatever securement was provided. This change in the strap angle will result in the strap being loaded at one edge. To investigate this condition the committee requested static and dynamic tests with the strap at an angle of 15 degrees as well as for a straight pull. The results of tests at a radius and angle where there were no failures at the radius of curvature were averaged. This average represents 100 percent of the strap capacity. Those tests at radii and angles where failure occurred at the radius of curvature are listed as the percent of the strap capacity for the five tests at the particular radius and angle.

Media Info

  • Features: Figures; Tables;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00080125
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: R-103
  • Files: TRIS
  • Created Date: Jan 29 1975 12:00AM