Composite Repair of Full-Scale Timber Bridge Chord Members Through the Process of Shear Spiking

Investigations into the effects of the addition of vertically-oriented shear spikes with fiberglass reinforced polymer rods have shown that the shear spikes increased the effective stiffness of the stringers of a full-scale timber bridge chord specimen. This was previously found to be true on dimension lumber and medium-sized timber. This report presents the results found from the flexural load testing of a full-scale timber bridge chord laboratory specimen. The bridge chord specimen was intentionally damaged to simulate degradation. Reinforcement was provided with 19 mm (3/4-in.) diameter fiberglass reinforced polymer shear spikes bonded to the wood by an epoxy resin. Shear spikes were installed in pairs vertically from the top of the member into pre-drilled holes to provide horizontal shear resistance and to improve the flexural effective stiffness. Results from the testing showed that with the insertion of five sets of shear spikes an average effective stiffness of 91.6% was recovered in the four stringers of the chord.

• Record URL:
  • https://www.ugpti.org/resources/reports/details.php?id=531
• 
• Supplemental Notes:
  • This research was funded by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108
• Authors:
  • Burgers, Travis A
  • Gutkowski, Richard M
  • Radford, Donald W
  • Balogh, Jeno
• Publication Date: 2005-12

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 98p

Subject/Index Terms

• TRT Terms: Bridge members; Degradation (Thermodynamics); Epoxy resins; Fiberglass; Flexural strength; Glass fiber reinforced plastics; Load tests; Material reinforcement; Polymers; Railroad bridges; Shear reinforcement; Shear strength; Spikes; Stiffness; Stringers; Testing; Wooden bridges
• Subject Areas: Bridges and other structures; Materials; Railroads;

Filing Info

• Accession Number: 01030697
• Record Type: Publication
• Report/Paper Numbers: MPC Report No. 05-173
• Files: UTC, TRIS
• Created Date: Aug 10 2006 10:44AM