Use of fiber reinforced polymer composite cable for post-tensioning application.

Details

• Creators:
  Mirmiran, Amir ; Yang, Xiong ; Zohrevand, Pedram ; Suksawang, Nakin ; Arockiasamy, Madasamy
• Corporate Creators:
  Florida International University. Dept. of Civil and Environmental Engineering ; Florida Institute of Technology. Civil Engineering Dept. ; Florida Atlantic University. Dept. of Civil, Environmental and Geomatics Engineering
• Subject/TRT Terms:
  • Carbon fibers
  • Fiber reinforced polymers
  • Posttensioning
  • Prestressed concrete bridges
  • Cables
  • Box girder bridges
  • Bridge piers
  • Steel wire
  • Alternatives analysis
  • Feasibility analysis
  More +
• Publication/ Report Number:
  BDK80-977-35 ; BDV29-977-10
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  The primary objective of this research project was to assess the feasibility of the use of innovative carbon fiber reinforced ; polymer (CFRP) tendons and to develop guidelines for CFRP in post-tensioned bridge applications, including segmental ; bridges and pier caps. The main motivation for the use of advanced composites is that they are not susceptible to corrosion, ; unlike prestressing steel. ; An experimental investigation and a numerical simulation were conducted to compare the performance of a scaled model ; of the Long Key segmental box girder bridge, post-tensioned with two types of carbon fiber strands and steel strands. The ; model was tested at different prestress levels and at different loading configurations. The most important distinction between ; the two types of carbon fiber strands is the elastic modulus, which are respectively 77% and 93% of that of steel strands. ; While the study confirms feasibility of both types of carbon fiber strands for segmental bridge applications, and their similar ; serviceability behavior, strands with higher elastic modulus could improve structural performance and minimize ; displacements beyond service loads. ; As the second component of the project, a side-by-side comparison of two types of carbon fiber strands against steel ; strands was conducted in a scaled model of a typical interior hammerhead with two identical cantilever overhangs. Two ; different strand arrangements were used for post-tensioning, with eight and six strands, respectively representing an over-design and a slight under-design relative to the factored demand. The model was tested under service and factored flexure ; and shear loads. The investigation confirmed the feasibility of using carbon fiber strands in unbonded post-tensioning of pier ; caps. Considering both serviceability and overload conditions, the general performance of the pier cap model under both ; flexure and shear loading was deemed acceptable using either type of carbon fiber strands and quite comparable to that of ; steel strands. ; In another component of this research, creep stress tests were conducted with carbon fiber composite cable (CFCC). The ; anchorages for all the specimens were prepared using a commercially available expansive grout. Specimens withstood 95% ; of the guaranteed capacity provided by the manufacturer for a period of five months, without any sign of rupture.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29192/dot_29192_DS1.pdf
• File Type:
  [PDF - 7.98 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1866ceab68e887c03b1aa38be6fc60ce652c929149bdba8976951fbd358a3dbb