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    Author(s): John M. Franklin; S. E. Taylor; Paul A. Morgan; M. A. Ritter
    Date: 1999
    Source: 1999 ASAE/CSAE-SCGR annual international meeting : emerging technologies for the 21st century ; Toronto, Ontario, Canada, July 18-21, 1999. St. Joseph, MI : American Society of Agricultural Engineers, [1999].:19 p. : ill.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (536 KB)

    Description

    Design criteria are needed specifically for portable bridges to insure that they are safe and cost effective. This paper discusses different portable bridge categories and their general design criteria. Specific emphasis is given to quantifying the effects of dynamic live loads on portable bridge design. Results from static and dynamic load tests of two portable timber bridges showed that dynamic loads can be significantly greater than static loads. Under smooth bridge entrance conditions, the mean dynamic bridge deflections were 1.13 times greater than static bridge deflections. Under rough bridge entrance conditions, mean dynamic bridge deflections were 1.44 times greater than static bridge deflections.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Franklin, John M.; Taylor, S. E.; Morgan, Paul A.; Ritter, M. A. 1999. Design criteria for portable timber bridge systems : static versus dynamic loads. 1999 ASAE/CSAE-SCGR annual international meeting : emerging technologies for the 21st century ; Toronto, Ontario, Canada, July 18-21, 1999. St. Joseph, MI : American Society of Agricultural Engineers, [1999].:19 p. : ill.

    Keywords

    Bridges, Composite wood assemblies, Static loads, Dynamic loads, Wood properties, Mechanical properties, Design, Portable systems

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https://www.fs.usda.gov/treesearch/pubs/5735