Behavior of Split Timber Stringers Reinforced with External GFRP Sheets

A large number of timber bridges are at the end of their service life in North America and the prohibitive costs of replacement make owners face the challenge of developing efficient rehabilitation techniques. This paper presents results from an experimental program of testing old full scale timber stringers with longitudinal splits. Stringers were reinforced for shear and bending using glass fiber-reinforced polymer (GFRP) sheets. Nine full-scale Douglas-fir beams were tested in 3-point bending after strengthening for flexure and shear with GFRP sheets. Horizontal shear forces in shear reinforcement were calculated using a simplified model. Beams that failed by debonding of shear reinforcement, failed at horizontal shear forces within the range of 150–266 kN. Design charts were constructed on the basis of these calculated forces to simplify the design of shear reinforcement for different sizes and locations of splits.

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  • Supplemental Notes:
    • Abstract reprinted with permission from ASCE
  • Authors:
    • Gomez, Sara
    • Svecova, Dagmar
  • Publication Date: 2008-3


  • English

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  • Accession Number: 01099822
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 21 2008 2:17PM