Composite-Based Rehabilitation of Constructed Bridge Girders with Grooved Geometrics

This report presents a research program studying the grooved bonding schemes of composite sheets (carbon fiber reinforced polymer, CFRP) for rehabilitating concrete members. The first phase of the research presents the efficacy of functional periodicity on controlling the occurrence of interfacial failure in concrete members strengthened with CFRP sheets. The hypothesis tested is that periodically placed stress reducers preserve the integrity of the CFRP-concrete interface by interrupting the progression of mechanical damage. The groove and U-wrap near the loaded-end dissipate interfacial fracture energy and impede stress progression. The second phase of the research discusses the potential and feasibility of an alternative bonding method for strengthening reinforced concrete beams with CFRP sheets. Periodic grooves are cut along the tensile soffit of the beams, in the transverse direction, on which CFRP is bonded and filled with an epoxy adhesive to lessen interfacial stresses. The tested bonding schemes comprise three grooves in the vicinity of CFRP-termination and uniformly distributed grooves in the beam span. The behavior of these beams is investigated in comparison with that of unstrengthened and conventional CFRP-bonded beams with plain substrates.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 48p

Subject/Index Terms

Filing Info

  • Accession Number: 01722074
  • Record Type: Publication
  • Report/Paper Numbers: MPC 19-402
  • Contract Numbers: MPC-554
  • Files: UTC, TRIS, ATRI, USDOT
  • Created Date: Nov 6 2019 12:25PM