LOADING HISTORY - SPAN NO 10 YELLOW MILL POND BRIDGE, I-95, BRIDGEPORT, CONNECTICUT

TWO SIMPLE-SPAN STRUCTURES ON HEAVILY TRAVELLED INTERSTATE 95 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 CONCRETE DECKING ON ROLLED COVER-PLATED BEAMS. STRAIN GAGES WERE MOUNTED AT CRITICAL END-OF- COVER-PLATE LOCATIONS AND AT MIDSPAN ON SELECTED BEAMS AND ON ONE DIAPHRAGM. A COMPUTER-CONTROLLED DATA-AQUISITION SYSTEM MADE IT POSSIBLE TO RECORD STRAINS ALMOST CONTINUOUSLY. TO SUPPLEMENT STRAIN DATA, TRUCK CLASSIFICATION AND LANE COUNTS WERE MADE AND TRUCK WEIGHTS AND MEASUREMENTS OBTAINED. IN ONE BRIDGE, 94-99 PERCENT OF THE STRESS RANGES OCCURING ON THE COVER-PLATE ENDS FELL WITHIN THE 0.60-1.95-KSI LEVELS, WITH ONLY ONE STRESS EVENT EXCEEDING 3.3 KSI. FOR THE OTHER BRIDGE, 88-97 PERCENT OF THE TOTAL STRESS EVENTS AT THE SAME POINTS RANGED BETWEEN 0.6-1.8 KS1, WITH 35 EVENTS EXCEEDING 3.0 KSI; THIS OVERWHELMING MAJORITY OF MIDSPAN STRESS RANGES OCCURING IN BOTH BRIDGES FELL BELOW 3.6 KSI; THIS RANGE EXCEEDED 7.2 KSI IN ONLY ONE CASE. GROSS TRUCK WEIGHTS WERE FAIRLY EVENLY 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 MIDDLE, AND LESS THAN 1 PERCENT INNER. /AUTHOR/

Media Info

  • Pagination: 70 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208069
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 8 1973 12:00AM