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 (4.8 MB)

Title: Feasibility of rehabilitating timber bridges with mechanically fastened FRP strips

Author: Schorer, Alyssa E.; Bank, Lawrence C.; Oliva, Michael G.; Wacker, James P.; Rammer, Douglas R.;

Date: 2008

Source: Madison : Midwest Regional University Transportation Center, College of Engineering, Dept. of Civil and Environmental Engineering, University of Wisconsin, 2008: ix, 93 p.

Publication Series: Miscellaneous Publication

Description: Many timber trestle railroad bridges in Wisconsin have experienced deterioration and are in need of rehabilitation. In addition, the railroad industry is increasing the weights of cars. The combined effect of heavier loads and deterioration threatens to cut short the service life of timber bridges. One of the most critical problems that has been identified was the overloading of timber piles in bridges, which can be remedied by creating a stiffer pile cap. The goal of this investigation was to show that mechanically fastened fiber reinforced polymer (MF¬FRP) strips fastened to timber with screws can be used to create composite action between two beams in flexure or truss action between two deep beams. Ultimately this may help redistribute the loads to piles when FRP strips are used as struts on cap beams over short spans. Several test series were conducted with beams in flexure, deep beams over short spans, and full scale specimens to determine the manner in which FRP strips improved the members’ performance. Tests were conducted over various widths of beams and lengths of spans to investigate how the geometry affected the strengthening’s ability to create composite action. Next, the MF-FRP was tested on deep beams to determine if composite action was maintained. Lastly, full scale tests simulating a pile cap over 5 piles were run to see if composite action improved load distribution to piles. Mechanically fastened FRP strips were found to be effective in developing composite action in slender beams in flexure, meaning the stiffness of the system was increased by using MF-FRP strips. This MF-FRP method showed great potential for creating composite, stiffer double pile caps.

Keywords: Elasticity, railroad bridges, maintenance, repair, bridges, inspection, wood deterioration, timber connectors, joints, service life, design, construction, testing, composite materials, loads, wood-plastic composites, wood plastic materials, performance testing, flexibility, stiffness, bending strength, timber bridges, connectors, wooden bridges, Wisconsin

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:


Schorer, Alyssa E.; Bank, Lawrence C.; Oliva, Michael G.; Wacker, James P.; Rammer, Douglas R. 2008. Feasibility of rehabilitating timber bridges with mechanically fastened FRP strips. Madison : Midwest Regional University Transportation Center, College of Engineering, Dept. of Civil and Environmental Engineering, University of Wisconsin, 2008: ix, 93 p.

 


 [ 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.