STUDY OF AASHO LOADINGS ON A CONCRETE BOX GIRDER BRIDGE MODEL

A BRIEF DESCRIPTION OF THE INSTRUMENTATION, CONSTRUCTION, AND TESTING OF A LARGE-SCALE, TWO-SPAN, FOUR-CELL, REINFORCED CONCRETE BOX GIRDER BRIDGE MODEL IS PRESENTED. TESTED IN THE LABORATORY, THE MODEL WAS A 1:2.82 SCALE OF A TYPICAL PROTOTYPE BRIDGE FOUND IN THE CALIFORNIA HIGHWAY SYSTEM. THE OVERALL PLAN DIMENSIONS OF THE MODEL AND THE PROTOTYPE WERE 12 BY 72 FT AND 34 BY 203 FT RESPECTIVELY. THE RESEARCH PROGRAM INCLUDED A STUDY OF THE THEORETICAL AND EXPERIMENTAL RESPONSE OF THE BRIDGE TO DEAD LOAD, LIVE LOADS AT WORKING STRESS AND OVERSTRESS LEVELS, AND ULTIMATE LOADING TO FAILURE. HOWEVER, THIS PAPER PRESENTS ONLY THE RESULTS OF THE INVESTIGATION DEALING WITH AN EVALUATION OF PRESENT AASHO LOADINGS ON BRIDGES OF THIS TYPE AND THE RESPONSE OF THE BRIDGE TO ACTUAL SCALED LOADS OF AASHO HS20-44 TRUCKS PLACED IN TWO OR THREE LANES AND OF A PROPOSED CLASS I OVERLOAD CONSTRUCTION VEHICLE PLACED IN ONE LANE ONLY. RESULTS INDICATE THAT CONCRETE BOX GIRDER BRIDGES HAVE EXCELLENT LOAD DISTRIBUTION PROPERTIES; HOWEVER, THE PRESENT AASHO EMPIRICAL FORMULA, WHICH IGNORES THE NUMBER OF LANES ON THE BRIDGE, UNDERESTIMATES THE TRUE VALUE FOR THREE LANES OF TRUCKS. TOTAL STRESSES IN THE STEEL AND CONCRETE UNDER THREE LANES OF AASHO TRUCKS OR ONE LANE OF THE OVERLOAD VEHICLE EXCEED ALLOWABLE VALUES, BUT NO DISTRESS IN THE BRIDGE WAS OBSERVED. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: p. 22-31
  • Monograph Title: Bridge evaluation and analysis
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00209903
  • Record Type: Publication
  • ISBN: 030902157X
  • Files: TRIS, TRB
  • Created Date: Aug 5 1973 12:00AM