TESTING OF A STEEL DECK BRIDGE

TESTS ARE REPORTED OF AN EXPERIMENTAL BRIDGE BUILT BY BETHLEHEM STEEL CORPORATION AT APARROWS POINT, MARYLAND, IN 1964. THE BRIDGE WAS BUILT TO EXPLORE THE USE OF PREFABRICATED ALL-STEEL MODULAR UNITS FOR THE CONSTRUCTION OF HIGHWAY BRIDGES IN THE SPAN RANGE OF 20 TO 100 FEET. ASPHALT SURFACING WITH EPOXY MEMBRANE PROVIDED A SATISFACTORY PROTECTION FOR THE STEEL DECK OVER 3 YEARS OF FIELD PERFORMANCE. A SMOOTH WEARING SURFACE WAS ALSO PROVIDED. THE DISTRIBUTION OF WHEEL LOADS TO THE WEBS AND TO THE BOTTOM FLANGES OF MULTIPLE UNITS WAS DETERMINED IN OVERALL BENDING, BY TEST-LOADING IN THE FIELD WITH VARIOUS VEHICLES. LOCAL BENDING STRESSES IN THE DECK ASSEMBLY WERE FOUND BY PLACING THE WHEELS OF A SMALL, SPECIALLY-LOADED FLATBED TRUCK BETWEEN TRANSVERSE FLOOR BEAMS. THE CRITICAL LOCAL STRESS WAS FOUND TO OCCUR AT THE BOTTOM OF A LONGITUDINAL RIB, AT THE POINT WHERE THE RIB PASSES OVER THE FLOOR BEAM. STRESSES WERE FOUND TO BE SENSITIVE TO THE NUMBER OF TIRES, AND TO THE LOAD ON THE TIRES. ONE EXAMPLE OF A DETAIL IMPROVEMENT IS THE ADOPTION OF INDIVIDUAL TRAPEZOIDAL RIBS IN PLACE OF THE CONTINUOUS CORRUGATION FOR EASIER FABRICATION AND BETTER WELD INSPECTION ON FUTURE DESIGNS. THE SLIDING FABREEKA-TEFLON BEARINGS FUNCTIONED WELL, WITH NO SIGN OF DISTRESS. RESULTS OF THE BRIDGE TESTS HAVE ADEQUATELY CONFIRMED THE BEHAVIOR OF THE STRUCTURE IN ACCORDANCE WITH THEORY AND HAVE LED TO IMPROVEMENTS IN DETAILS AND CONCEPTS FOR SECOND-GENERATION DESIGNS.

Media Info

  • Media Type: Print
  • Features: Figures;
  • Pagination: pp 21-34
  • Monograph Title: Bridges
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00208909
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 23 1994 12:00AM