AN INVESTIGATION OF THE TRANSVERSE DISTRIBUTION OF LIVE LOADS ON A POST-TENSIONED CONCRETE SPREAD BOX-GIRDER TYPE BRIDGE - FINAL REPORT

THE EXPERIMENTAL TRANSVERSE LIVE LOAD DISTRIBUTION ON A SPREAD BOX-GIRDER TYPE BRIDGE WAS DETERMINED AND COMPARED WITH RESULTS GAINED FROM SIMILAR STUDIES OF OTHER BRIDGES OF THIS GENERAL TYPE. THE TEST STRUCTURE IS A NEWLY CONSTRUCTED BRIDGE LOCATED NEAR THE MOUTH OF SKOOKUMCHUCK CREEK IN THE SALMON RIVER CANYON NEAR WHITE BIRD, IDAHO. IT CONSISTS OF FIVE CAST-IN-PLACE AND POST-TENSIONED TRAPEZOIDAL BOX GIRDERS, A COMPOSITE CAST-IN-PLACE REINFORCED CONCRETE SLAB AND REINFORCED CONCRETE CURBS. ALL OF THE TESTS WERE CONDUCTED WITH ONE SERIES OF GAGES. THE BRIDGE MIDSPAN WAS SELECTED AS THE GAGE SECTION FOR DETERMINATION OF THE TRANSVERSE LIVE LOAD DISTRIBUTION. IN ADDITION TO THE MIDSPAN SECTION, GAGES WERE LOCATED ALONG THE LONGITUDINAL CENTERLINES OF THE BOTTOM SURFACES OF THE GIRDERS TO DETERMINE THE LOCATION OF THE MAXIMUM BOTTOM FIBER STRAINS. ONE GAGE WAS ALSO EMBEDDED IN THE CONCRETE APPROXIMATELY 1 1/2 INCHES FROM THE BOTTOM OF EACH GIRDER AT ITS MIDSPAN. THE WHEEL LOADS WERE INDUCED BY TWO TEST VEHICLES WHICH WERE LOADED WITH GRAVEL TO APPROXIMATE THE H 20-44 AND HS 20-44 DESIGN TRUCKS AS SPECIFIED IN THE AASHO SPECIFICATION. THE TEST RUNS WERE FROM NORTH TO SOUTH AT 2 TO 3 MPH. STATIC STRAIN RESPONSES WERE ALSO TAKEN AND COMPARED TO THE CRAWL RUN STRAIN RESPONSES. THE DATA IN THIS REPORT IS BASED ON THE CRAWL RUN STRAIN RESPONSES. STRAIN AND DEFLECTION MEASUREMENTS WERE RECORDED BY CONTINUOUS STRAIN RECORDING EQUIPMENT. THE FIELD TEST DATA WERE REDUCED TO STRAINS AND DEFLECTIONS. FROM THE STRAIN DATA EXPERIMENTAL NEUTRAL AXIS LOCATION, MOMENT PERCENTAGE DISTRIBUTIONS, MOMENT DISTRIBUTION COEFFICIENTS, DISTRIBUTION FACTORS AND EFFECTIVE VALUES OF ELASTIC MODULI WERE DETERMINED. THE MOMENT PERCENTAGES, RATIOS OF EXPERIMENTAL MOMENTS TO DESIGN MOMENTS, DISTRIBUTION FACTORS AND BOTTOM GIRDER FIBER STRAINS WERE COMPARED WITH SIMILAR QUANTITIES DEVELOPED IN THE TESTS OF THE DREHERSVILLE, BERWICK, WHITE HAVEN AND PHILADELPHIA BRIDGES. /AUTHOR/

  • Corporate Authors:

    University of Idaho, Moscow

    Moscow, ID  United States  83844
  • Authors:
    • Haber, D F
    • Rice, D E
  • Publication Date: 1972-6

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 86 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00209752
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 13 1972 12:00AM