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
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  • Resource Type:
    Tech Report
  • TRIS Online Accession Number:
    629103
  • 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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