FATIGUE LIFE OF BRIDGES UNDER REPEATED HIGHWAY LOADINGS

AN INVESTIGATION WAS MADE TO DETERMINE CUMULATIVE EFFECTS OF VEHICLE LOADINGS ON THE USEFUL LIFE OF STEEL-STRINGER HIGHWAY BRIDGES TYPICAL OF THOSE ENCOUNTERED ON HEAVILY TRAVELED ROUTES IN ALABAMA. THREE TYPICAL STEEL-STRINGER BRIDGES WERE SELECTED FOR STRAIN-GAUGE INSTRUMENTATION AND DATA COLLECTION TO OBTAIN THEIR IN-SERVICE STRESS HISTORIES. STRAIN-EVENT DATA WERE COLLECTED AT CRITICAL POINTS ON THE STEEL STRINGERS OF EACH BRIDGE UNTIL A REPRESENTATIVE 24- HOUR AROUND-THE-CLOCK SAMPLE WAS OBTAINED. TRUCK COUNTS AND CLASSIFICATIONS WERE MADE DURING THE 24 HOURS OF SAMPLING TO ESTIMATE THE ANNUAL VOLUME OF TRUCKS PRODUCING SIGNIFICANT STRESSES IN THE STEEL STRINGERS AND TO ESTABLISH TRUCK-TYPE FREQUENCY DISTRIBUTIONS AT EACH BRIDGE. FATIGUE CURVES WERE DEVELOPED FOR THE STEEL STRINGERS AND WERE USED IN CONJUNCTION WITH THE STRESS HISTORIES AND CURRENTLY ACCEPTED FATIGUE CONCEPTS TO ESTIMATE THE FATIGUE LIFE OF EACH BRIDGE. RESULTS INDICATED THAT THE BRIDGES WERE NOT IN PRESENT DANGER OF FATIGUE FAILURE. HOWEVER, THIS CONCLUSION IS LIMITED TO THE 3 BRIDGES INVESTIGATED AND THE INTERPRETATION OF THE CUMULATIVE EFFECTS OF THE STRESS EVENTS RECORDED AT EACH BRIDGE. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 13-20
  • Monograph Title: Loading history of bridges
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00209703
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 7 1972 12:00AM