AN INVESTIGATION OF THE BEHAVIOR OF A THREE-SPAN COMPOSITE HIGHWAY BRIDGE

THIS INVESTIGATION CONSIDERED THE FEASIBILITY OF CONDUCTING A FATIGUE TEST AND A SUBSEQUENT ULTIMATE LOAD TEST ON A THREE-SPAN CONTINUOUS COMPOSITE HIGHWAY BRIDGE IN BUTLER COUNTY, MISSOURI. AN ANALYTICAL STUDY, IN WHICH THE BRIDGE WAS TREATED AS A MULTI-DEGREE OF FREEDOM SYSTEM, SHOWED THAT CRITICAL FATIGUE ZONES OCCUR IN THE FLANGES WITHIN THE END SPANS. THE BASE METAL UNDER THE TOP-FLANGE SHEAR CONNECTORS BETWEEN A FIELD SPLICE AND THE END OF A COVER PLATE AND THE BASE METAL AT THE END OF A COVER PLATE IN THE TOP AND BOTTOM FLANGES ARE SUSCEPTIBLE TO FATIGUE FAILURE. THIS ANTICIPATED TEST BEHAVIOR SIMULATES THE CONCERN OF THE CURRENT AASHO SPECIFICATIONS. FATIGUE FAILURE IS PROBABLE WITHIN 600,000 CYCLES, AT A STRESS RANGE OF APPROXIMATELY 14 KSI. A SHAKEDOWN ANALYSIS OF THE BRIDGE REVEALED THAT AN ULTIMATE LOAD TEST COULD BE PERFORMED IF THE BRIDGE DECK IS CUT LONGITUDINALLY, TO INCLUDE ONLY THE TWO INTERIOR GIRDERS. THE TEST VEHICLE RECOMMENDED FOR THIS TEST IS A SPECIAL OVERLOAD VEHICLE SUCH AS A MILITARY TANK CARRIER, WHICH SHOULD CAUSE INCREMENTAL COLLAPSE OF THE REDUCED BRIDGE. A SERIES OF STEADY-STATE RESONANCE TESTS WERE CONDUCTED ON A SINGLE-SPAN COMPOSITE MODEL TO ASSESS THE PRACTICABILITY OF THE PROPOSED FATIGUE TESTING TECHNIQUE. THESE LABORATORY TESTS VERIFIED THAT A "MOVING MASS" - ELECTROHYDRAULIC ACTUATOR COMBINATION ATTACHED TO THE MODEL-WOULD PERFORM SATISFACTORILY AS A LOADING TECHNIQUE TO INDUCE RESONANT VIBRATIONS. THE PERFORMANCE OF THIS SYSTEM ESTABLISHED THE CAPABILITY OF THIS TECHNIQUE TO PRODUCE THE REQUIRED STRESS LEVELS FOR THE FATIGUE TEST ON THE PROTOTYPE BRIDGE. /AUTHOR/

  • Record URL:
  • Supplemental Notes:
    • STUDY 71-4
  • Corporate Authors:

    University of Missouri, Columbia

    College of Engineering
    Columbia, MO  United States  65211
  • Authors:
    • Salane, H J
    • Duffield, R C
    • McBean, R P
    • Baldwin, J W
    • Galambos, T V
  • Publication Date: 1971

Media Info

  • Pagination: 303 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208068
  • Record Type: Publication
  • Source Agency: Missouri State Highway Commission
  • Files: TRIS, STATEDOT
  • Created Date: Feb 11 1973 12:00AM