Performance of mechanically fastened FRP strengthened concrete beams in flexure

Jeremy A. Martin, Anthony J. Lamanna

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


The use of adhesively bonded fiber-reinforced polymer (FRP) materials has become widely accepted for use in flexural strengthening applications; however, the method of attachment presents drawbacks in application. These include extensive time and labor investments, as well as a tendency of the system to fail in a brittle manner. This paper presents a study of a series of reinforced concrete beams each strengthened in flexure with an FRP strip attached with large diameter concrete screws. The concrete screws were arranged in a variety of patterns. The effect of fastener number and spacing, as well as the effect of fastener pattern on the behavior of the beam, was investigated through the use of two groups of specimens. The beams in each group were tested to failure to verify the behavior of the strengthening system. Measured behavior was then used to determine an analytical approach for prediction of load response behavior of mechanically fastened systems. It was found that the strengthening method investigated improved the flexural capacity of the specimens 12 to 39% with little or no loss in ductility.

Original languageEnglish (US)
Pages (from-to)257-265
Number of pages9
JournalJournal of Composites for Construction
Issue number3
StatePublished - May 28 2008
Externally publishedYes


  • Concrete beams
  • Concrete, reinforced
  • Fiber reinforced polymers
  • Flexural strength
  • Rehabilitation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Mechanical Engineering


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