LOADING HISTORY OF SPAN 10 ON YELLOW MILL POND VIADUCT

TWO SIMPLE-SPAN STRUCTURES ON HEAVILY TRAVELED INTERSTATE 95 IN BRIDGEPORT, CONNECTICUT, WERE TESTED ELECTRONICALLY TO DETERMINE THE MAGNITUDE AND FREQUENCY OF STRESS RANGES INDUCED BY NORMAL LIVE LOADING. THE BRIDGES WERE DESIGNED IN ACCORDANCE WITH COMPOSITE- ACTION TECHNIQUES AND CONSISTED OF 7 1/2-IN. CONCRETE DECKING ON ROLLED COVER-PLATED BEAMS. STRAIN GAUGES WERE MOUNTED AT THE CRITICAL ENDS OF COVER PLATES AND AT MIDSPAN ON SELECTED BEAMS AND ON ONE DIAPHRAGM. A COMPUTER-CONTROLLED DATA ACQUISITION SYSTEM MADE IT POSSIBLE TO RECORD STRAINS CONTINUALLY. AS A SUPPLEMENT TO STRAIN DATA, LANE COUNTS WERE MADE AND TRUCK CLASSIFICATIONS AND WEIGHTS AND MEASUREMENTS OBTAINED. GROSS TRUCK WEIGHTS WERE DISTRIBUTED BETWEEN 10,000 AND 70,000 LB WITH MAXIMUM WEIGHT RECORDED AT BETWEEN 90,000 AND 100,000 LB. DISTRIBUTION OF TRUCK TRAFFIC WAS APPROXIMATELY 55 PERCENT IN THE OUTER LANE, 45 PERCENT IN THE MIDDLE LANE, AND LESS THAN 1 PERCENT IN THE INNER LANE. ON THE BASIS OF CURRENT POPULAR METHODS OF FATIGUE ANALYSIS, WHICH TEND TO NEGLECT STRESS RANGES BELOW 3 KSI, FATIGUE FAILURE OF THE BEAMS TESTED WOULD BE CONSIDERED A REMOTE POSSIBILITY FOR THE NEAR FUTURE. THE NUMEROUS LOW STRESS RANGES INDUCED BY LIVE LOADING, ALTHOUGH THEIR EFFECT ON THE INTEGRITY OF COVERPLATED BEAMS IS UNKNOWN, COULD PERHAPS DRASTICALLY SHORTEN THE SERVICE LIVES OF THESE MEMBERS. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; Tables;
  • Pagination: pp 64-71
  • Monograph Title: Bridge evaluation and analysis
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00209907
  • Record Type: Publication
  • ISBN: 030902157X
  • Files: TRIS, TRB
  • Created Date: Aug 5 1973 12:00AM