BRIDGES CONSTRUCTED FROM RAILROAD CARS. FINAL REPORT

The objectives of the study consisted of determining present to future usage of railroad car bridges, development of a railroad car data archive, and development of load ratings software for railroad cars. A survey instrument was sent to all cities and county judges in Arkansas in 1988. Thirty-six of the 75 judges reported that railroad car bridges were being used in their counties, and that 167 railroad car bridges are in use, up from 74 reported in 1986. Drawings and specifications were obtained for six box cars but none of the flat cars and a limited archive was developed. Software was developed which determined the load rating for a railroad car bridge. The program was checked by 1) building and testing a one-third scale model of a railroad car frame, and 2) testing four bridges in the field. A one-third scale model of a typical box car frame was constructed, instrumented, and tested. The calculated strains by the analysis program were within ten percent of the measured strains for the model with single and tandem axle loads. It was found that the analysis did not accurately predict the behavior of the model when it was subjected to point loads which resulted in a torsion rotation. A series of eight destructuve tests were carried out on the scale model. The tests revealed that there was a good agreement between the strains measured in the model and the strains predicted by the finite element analysis when there was limited damage. Four railroad car bridges were field tested and the results were compared to the load rating program. Reasonable accuracy was obtained by the program.

Media Info

  • Pagination: 278 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00619181
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/AR-91/004
  • Contract Numbers: TRC-8901
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Feb 29 1996 12:00AM