TESTS OF RAIL FASTENERS FOR PARSONS BRINCKERHOFF-TUDOR- BECHTEL

THE REPORT SUMMARIZES RESULTS OF COMPREHENSIVE TESTING CONDUCTED AMONG SEVERAL TYPES OF RAIL FASTENERS FOR APPLICATION IN THE BAY AREA RAPID TRANSIT (BART) SYSTEM. THE PROPOSED FASTENERS ARE DEVICES WHICH HOLD RAILROAD TRACKS IN PLACE TO PREVENT SLIPPAGE AND TO MAINTAIN PRECISE ALIGNMENT. THE TESTING PROGRAM WAS UNDERTAKEN TO EVALUATE ALTERNATIVE FASTENER DESIGN AND TO COLLECT DETAILED PERFORMANCE DATA UNDER A WIDE VARIETY OF SIMULATED CONDITIONS. THE REPORT EXAMINES THE ABILITY OF FASTENERS TO: (1) PREVENT RAIL MOVEMENT UNDER LONGITUDINAL FORCES RESULTING FROM THERMAL CHANGES; (2) RESIST LATERAL FORCES AND ALTERNATING COMBINATIONS OF VERTICAL AND HORIZONTAL LATERAL LOADS; (3) MAINTAIN ELECTRICAL INSULATION; AND (4) MAINTAIN BOLT TENSION AT SPECIFIED TOLERANCES. THE TESTING PROGRAM WAS DESIGNED TO REPRODUCE STRESSES TYPICAL OF THOSE LIKELY TO OCCUR IN THE FINISHED BART SYSTEM. TWO SPECIMENS OF EACH FASTENER WERE SUBJECTED TO A DIFFERENT BATTERY OF TESTS COVERING ALL RELEVANT ASPECTS OF LOAD-SLIP AND RAIL WEAR. FAILURE OF ANY FASTENER OR COMPONENT RESULTED IN A SUSPENSION OF THE TESTING UNTIL A RE-DESIGN COULD BE SUBMITTED. THE REPORT DESCRIBES EACH SPECIFIC TEST IN DETAIL WITH REFERENCE TO PROCEDURE, INSTRUMENTATION, AND FORCES OR LOAD FACTORS APPLIED. /UMTA/

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Filing Info

  • Accession Number: 00241781
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Oct 9 1972 12:00AM