LATERAL DISTRIBUTION OF VEHICULAR LOADS IN A PRESTRESSED CONCRETE BOX-BEAM BRIDGE -BERWICK BRIDGE

THE FIELD TESTING IS DESCRIBED OF THE SECOND OF FIVE BEAM- SLAB BRIDGES INCLUDED IN AN INVESTIGATION OF LATERAL DISTRIBUTION OF LOAD IN PRESTRESSED CONCRETE BOX GIRDER BRIDGES. THE TEST STRUCTURE CONSISTED OF FOUR HOLLOW PRESTRESSED CONCRETE BOX GIRDERS, WHICH WERE 48 INCHES WIDE BY 39 INCHES DEEP, A COMPOSITE REINFORCED CONCRETE CAST-IN- PLACE SLAB, AND CAST-IN-PLACE CURBS AND PARAPETS. THE SPACING OF THE GIRDERS WAS 8 FEET 9-3/8 INCHES, AND THE SIMPLY-SUPPORTED TEST SPAN WAS 65 FEET 3 INCHES. THREE CROSS-SECTIONS WERE GAGED FOR THE MEASUREMENT OF SURFACE STRAINS AND DEFLECTIONS, AND ALL DATA WAS COLLECTED THROUGH USE OF CONTINUOUS RECORDING EQUIPMENT. THE LOAD WAS SUPPLIED BY A TRUCK LOADED TO SIMULATE THE AASHO HS20-44 DESIGN VEHICLE. THE LOADING CONDITIONS CONSISTED OF EITHER STATIC RUNS WITH THE TRUCK PARKED ON THE BRIDGE, OR CRAWL RUNS WITH THE TRUCK TRAVELING ACROSS THE BRIDGE AT 2 TO 3 MPH. THE PRINCIPAL OBJECTIVES WERE TO DEVELOP INFORMATION ON LATERAL DISTRIBUTION OF VEHICLE LOADS TO THE GIRDERS, AND TO COMPARE THE STRUCTURAL RESPONSE AT DIFFERENT CROSS-SECTIONS. IN ADDITION, THE EFFECT OF GIRDER SPACING WAS TO BE STUDIED BY COMPARING THE TEST RESULTS FROM THIS BRIDGE WITH THE RESULTS FROM THE PILOT STUDY BRIDGE. DISTRIBUTION FACTORS AND THE RATIO OF EXPERIMENTAL MOMENT TO DESIGN MOMENT WERE COMPARED AT THE DIFFERENT CROSS-SECTIONS OF THE TEST BRIDGE AND WITH SIMILAR RESULTS FROM THE PILOT STUDY BRIDGE. ON THIS BRIDGE THE DISTRIBUTION FACTORS DID NOT VARY SIGNIFICANTLY BETWEEN CROSS-SECTIONS. THIS WAS ALSO TRUE OF THE RATIOS OF EXPERIMENTAL MOMENT TO DESIGN MOMENT. THE DISTRIBUTION FACTOR USED TO DESIGN THE INTERIOR GIRDERS WAS FOUND TO BE GREATER THAN THE MEASURED VALUES, WHILE THE DESIGN FACTOR FOR THE EXTERIOR GIRDERS WAS LESS THAN THE MEASURED VALUES. A COMPARISON OF RESULTS FROM THIS BRIDGE AND THE PILOT STUDY BRIDGE SHOWED THAT RATIOS BETWEEN DESIGN AND EXPERIMENTAL MOMENT WERE ABOUT THE SAME FOR INTERIOR GIRDERS BUT VARIED CONSIDERABLY FOR EXTERIOR GIRDERS, INDICATING THE EFFECT OF THE DIFFERENT GIRDER SPACINGS. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/3/, BPR-315
  • Corporate Authors:

    Lehigh University

    Bethlehem, PA  United States  18015

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  United States  17120-0095

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • GUILFORD, A A
    • VanHorn, D A
  • Publication Date: 1967-10

Media Info

  • Features: References;
  • Pagination: 104 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00207858
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Apr 2 1994 12:00AM