Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (536 KB bytes)

Title: Design criteria for portable timber bridge systems : static versus dynamic loads

Author: Franklin, John M.; Taylor, S. E.; Morgan, Paul A.; Ritter, M. A.;

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

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.

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

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

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.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.