Repairing/strengthening of bridges with post-tensioned FRP materials and performance evaluation.

Details

• Creators:
  Cai, C.S. ; Xia, Miao
• Corporate Creators:
  Louisiana State University. Dept. of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration ; Louisiana. Dept. of Transportation and Development
• Subject/TRT Terms:
  Bridges Fiber Composites Fiber Reinforced Polymers Finite Element Method Flexural Strength Girders Mechanical Properties Posttensioning Rehabilitation (Maintenance)
• Publication/ Report Number:
  FHWA/LA.11/488
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  One of the challenges that transportation agencies are facing is to keep bridges in good condition during their service life.
  
  Numerous bridges are classified as structurally and/or functionally deficient in the country. In the state of Louisiana, 4,591
  
  bridges, or 34 percent of the total 13,426 bridges, are classified as substandard. Load capacity degradation, increased gross
  
  vehicle weight, and increasing traffic demand lead to the deficiencies. One of the most effective ways to solve the problem
  
  is to use composite materials to strengthen existing bridges. As rapidly developed over the past several decades, different
  
  kinds of composite fiber reinforced polymers (FRP) have been regarded as one of the best solutions to several problems
  
  associated with transportation and civil engineering infrastructures. Some of the major benefits of FRP include high strength
  
  to weight ratio, high fatigue endurance, excellent corrosion resistance, low thermal expansion, and the ease of fabrication,
  
  manufacturing, handling, and installation. The main objective of this research was to develop a flexural resistance designing
  
  process using post-tensioning prestressed carbon reinforced polymers (CFRP) laminates adhering to bridge girders to avoid
  
  various possible flexural failure modes. It is noted that, in the original plan, a steel bridge and a concrete bridge was to be
  
  rehabilitated with prestressed FRP laminates or rods and the bridge performance was to be monitored. However, the sponsor
  
  decided not to pursue the field implementation due to cost. This report presents a review of the up-to-date work on bridges
  
  strengthened with FRP materials. Mechanical properties of FRP fibers and composites were presented in detail.
  
  Investigators presented previous research findings on experiments of FRP composite materials used as various prestressed
  
  tendons, and the analyses for different failure modes were introduced. To investigate the effect of rehabilitation with
  
  prestressed CFRP laminates, two 3-D finite element analyses were conducted to examine the deflection and bottom fiber
  
  stress at the mid-span. A detailed designing process of rehabilitation with prestressed CFRP laminates was presented in this
  
  report. A feasible plan to enhance the flexural capability of an existing bridge with externally prestressed CFRP laminates
  
  according to AASHTO and ACI code specifications was also proposed in this report
  
  
• Format:
  PDF
• Funding:
  LTRC Project Number: 07-3ST ; SIO: 30000130
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6ddedcff274f532f2cfc99d787ead69b9463d1822290ae761a29103549350d0a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29399/dot_29399_DS1.pdf
• File Type:
  [PDF - 1.48 MB ]