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:
  Alternatives Analysis Box Girder Bridges Bridge Piers Cables Carbon Fibers Creep Tests Feasibility Analysis Fiber Reinforced Polymers Posttensioning Prestressed Concrete Bridges Steel Wire

  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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1866ceab68e887c03b1aa38be6fc60ce652c929149bdba8976951fbd358a3dbb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29192/dot_29192_DS1.pdf
• File Type:
  [PDF - 7.98 MB ]