Most states, including Ohio, have recently seen increasing numbers of overweight permit trucks and requests for even heavier and more frequent overloads. A major concern is the effect of such loads on the safety and remaining life of highway bridges. The study used a statistical data base for bridge loadings and simulated the effects of permit overloads. The simulation included distributions of truck weights, volumes, multiple lane occupancy and vehicle spacings. The output was a distribution (mean and coefficient of variation) of maximum load effect for a specified time duration ranging from a single vehicle crossing to a two-year inspection interval. A reliability model of bridge safety consistent with recent AASHTO code developments was broadened to cover permit loadings. Three categories of permit trucks were considered including (a) routine frequent permits, (2) special-single passage permits, and (3) escorted vehicles. For each permit category, load factors were derived to produce target reliability levels. Examples are included. The recommendations for reviewing permit loads were implemented in a specification format. These provisions are being incorporated in the proposed new AASHTO Maintenance Inspection Manual now under review.


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    Title :

    Reliability Analysis of Permit Loads on Bridges


    Contributors:
    F. Moses (author) / G. K. Fu (author) / Y. W. Liu (author)

    Publication date :

    1990


    Size :

    130 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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