TRUCK CHARACTERISTICS AND STRESS SPECTRA FOR STEEL HIGHWAY BRIDGES

This article summarizes the results of tests conducted on various types of steel highway bridges to ascertain the induced stresses on various elements caused by random traffic. Vehicle characteristics obtained include truck type, dimensions, and weights. This article further clarifies the experimental and data reduction procedures that were used to collect this information. Bridge types examined include single, three, four and five span bridges, end anchor bridges, suspended-span and semisuspended-span bridges. Stress response of a bridge is influenced by the vehicle crossing the bridge. Observations of truck characteristics and their frequency of distribution during a given time interval were made during most of the load history tests. Data is then used to develop typical truck types. During the load history field tests, the induced strains on various elements of the bridges were monitored. The recording and reduction of strains (stresses) were accomplished by various technqiues and equipment such as a computer system, signal conditioning modules, amplifiers, analog-to-digital converter, a 14-channel oscillograph, a light beam oscillograph, and a 7-channel analog 7-tape recorder. The determination of vehicle loads were generally performed by portable weighing scales or at a permanent weighing station. The vehicle distribution by classification was generally noted visually and recorded. Results of the tests conducted indicate that the recorded stresses are much lower than the design values, and the characteristics of the vehicles which induce such stress also differ from the AASHTO truck loadings. These differences suggest a possible revision in the fatigue design codes. Alternate procedures, which include the information collected from field tests, have been suggested.

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  • Corporate Authors:

    Federal Highway Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Heins, C P
    • Derucher, K N
  • Publication Date: 1977-12

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Filing Info

  • Accession Number: 00173897
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: May 31 1978 12:00AM