Accurate and Rapid Determination of Fatigue Damage in Bridge Superstructures
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Accurate and Rapid Determination of Fatigue Damage in Bridge Superstructures

Filetype[PDF-2.90 MB]

  • English

  • Details:

    • Resource Type:
    • TRIS Online Accession Number:
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
    • Abstract:
      Fifteen representative steel bridges throughout the State of Illinois were

      instrumented with foil strain gages to determine their frequencies of loading

      and the magnitudes of stresses induced by traffic over a 3 to 8-hour period,

      depending on traffic volume. Reinforced prestressed or post-tensioned concrete

      bridges were not included in this study. Fatigue prone details, such as cover

      plated wide flanges, were instrumented. For each stress range increment

      gathered by the data acquisition system, the cumulative damage sustained over

      an extended number of years was compared with the number of available fatigue

      cycles for that stress range using published S-N data for various details and

      the Palmgren Miner linear damage rule. A new equation for factor of safety

      for structural details subject to fatigue is described, taking dead load, live

      load, and bridge detail fatigue strengths into account. A new histogram-linear

      damage method of assessing future fatigue damage in bridges which takes

      traffic growth and increased truck weights Into account is also described.

      Other non-welded designs to main load carrying members were examined for

      susceptibility to fatigue effects, including riveted beams, weathering steels,

      reinforced concrete in air (without severe cracking), and post-tensioned beams

      through a review and discussion of the literature. The actual effect of an

      increase in gross vehicle weight on the measured maximum stress range response

      of a particular bridge was measured. The histogram-linear damage method

      favorably compared with the root mean cube-linear damage method and to the

      fatigue damage procedures given in NCHRP 299.

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