MODEL STUDIES OF SKEW BOX-GIRDER BRIDGES

THIS REPORT PRESENTS THE RESULTS OF LABORATORY TESTS ON A SERIES OF SMALL-SCALE ALUMINUM MODELS OF RECTANGULAR AND SKEW BOX-GIRDER BRIDGES. THE TESTS WERE CONDUCTED PRIMARILY TO PROVIDE EXPERIMENTAL RESPONSE DATA FOR SKEW BRIDGES, AND DATA BY WHICH TO CHECK THE ACCURACY OF PROPOSED ANALYTICAL SOLUTIONS FOR THE ELASTIC BEHAVIOR OF BRIDGES OF THIS TYPE. THE PROTOTYPE DESIGN IN ALL CASES WAS A FOUR-CELL BOX SECTION WITH A TOTAL WIDTH OF 33 FT. 10 IN. THE SPANS VARIED FROM 54.4 FT. TO 167.9 FT., AND THE SKEW ANGLES FROM 0 TO 45. ALL TESTS WERE CONDUCTED ON A SINGLE MACHINED ALUMINUM MODEL. STARTING WITH THE LONGEST RECTANGULAR BRIDGE, THE MODEL WAS CUT BACK IN SEQUENCE TO SKEW ANGLES OF 45, 30, 45, 30, AND 0 DEGREES RESPECTIVELY WITH SUCCESSIVE REDUCTIONS IN SPAN LENGTHS. ALL SKEW BRIDGES WERE TESTED BOTH WITH AND WITHOUT A RIGHT TRANSVERSE DIAPHRAGM AT MID-SPAN, AND UNDER 13 DIFFERENT LOCATIONS OF A SINGLE VERTICAL POINT LOAD. REACTIONS WERE MEASURED BY FOUR LOAD CELLS, DEFLECTIONS AT 11 LOCATIONS BY DIAL GAGES, AND STRAINS BY 68 ROSETTE GAGES AND FOUR SINGLE ELEMENT GAGES LOCATED ON A RIGHT CROSS SECTION CLOSE TO MID-SPAN. ALL LOAD AND STRAIN READINGS WERE TAKEN AND REDUCED BY COMPUTER, AND THIS DATA WAS CHECKED FOR SELF-CONSISTENCY BY THREE INDEPENDENT STATIC CHECKS. THE DATA PRESENTED IN THE REPORT INCLUDED EXTERNAL REACTIONS, DEFLECTIONS AT SELECTED POINTS ALONG THE WEBS, AND AXIAL PLATE FORCES AND TRANSVERSE PLATE BENDING MOMENTS ON THE TRANSVERSE SECTION CLOSE TO MID-SPAN. ALSO DEDUCED IN EACH TEST WAS DISTRIBUTION OF TOTAL MOMENT AT MID-SPAN BETWEEN THE INDIVIDUAL I-BEAMS THAT COMPRISE THE BOX SECTION. THE REPORT CONCLUDES WITH SOME OBSERVATIONS ON THE GENERAL BEHAVIOR OF THE SKEW BOX GIRDER BRIDGES TESTED, AND A BRIEF COMPARISON OF EXPERIMENTAL AND CERTAIN THEORETICAL RESULTS. /AUTHOR/

  • Supplemental Notes:
    • Rept No UC SESM 71-26
  • Corporate Authors:

    University of California, Berkeley

    Berkeley, CA  United States  94720
  • Authors:
    • GODDEN, W G
    • Aslam, M
  • Publication Date: 1971-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 187 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00209644
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 23 1972 12:00AM