The file name is AAR 4. This program calculates the Cooper rating of each member in trusses of any configuration. The restrictions placed on trusses containing counters described for Program No. 2, apply to this program. Trusses may be simply supported, continuous over several supports, internally indeterminate or contain counter diagonals. The span cannot exceed 620 feet, the truss can have no more than 50 joints or 100 members or 25 panels, and the number of panels with counters cannot exceed 10. No compression member may have a slenderness ratio (L/r) greater than 200. The imput data required is the dead loading the truss geometry, properties of members, the type of materials and riveted or pinned connections. Output is similar to the earlier program but includes Cooper rating of each member with full steam impact at synchronous speed or with full diesel impact (40 mph) and at reduced speeds of 30, 20 and 10 mph for diesel impact. Rating is in accordance with 1967 AREA specifications; however, wind loads are not considered.

Subject/Index Terms

Filing Info

  • Accession Number: 00098747
  • Record Type: Publication
  • Source Agency: American Railway Engineering Association
  • Files: TRIS
  • Created Date: Aug 27 1975 12:00AM