Development of a precast bridge deck overhang system

Details

• Creators:
  Trejo, David ; Mander, John ; Mander, Thomas ; Henley, Mathew ; Scott, Reece ; Ley, Tyler ; Patil, S.
• Corporate Creators:
  Texas. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridge decks
  • Precast concrete
  • Prestressed concrete
  • Prestressed concrete bridges Precast
  • Prestressed
  • Bridge Overhang
  • Grout
  • Constructability
  • Bridge Deck Panel
• Publication/ Report Number:
  FHWA/TX-10/0-6100-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical Report; October 2007¿August 2009
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  Prestressed-precast panels are commonly used at interior beams for bridge decks in Texas. The use of these panels can provide ease ; of construction, sufficient capacity, and good economy for the construction of bridge decks in Texas. Current practice for the ; overhang deck sections require that formwork be constructed at the outer edges of the bridge. The cost of constructing the bridge ; overhang is significantly higher than that of the interior sections where precast panels are used. The development of a precast ; overhang system has the potential to improve economy and safety in bridge construction. This research investigated the overhang ; and shear capacity of a precast overhang system for potential use during the construction of bridges with precast overhang panels. ; The research was performed in three phases: the Phase 1 research including work specifically for the Rock Creek Bridge in Parker ; County, Texas; the Phase 2 research for general precast overhang panels, and; the Phase 3 research investigating the shear capacity. ; Grout material characteristics were also assessed for possible use in the haunch; constructability issues were also addressed. Results ; indicate that the capacity of the precast overhang system is sufficient to carry factored AASHTO loads with no or very limited ; cracking. Results from the shear study indicate that the shear capacity of threaded rods with couplers is lower than the conventional ; R-bar system. However, sufficient shear capacity can be achieved if sufficient pockets in the precast overhang panel are provided. A ; recommendation for the haunch form system for use on the bridge is also provided. The use of the precast overhang system ; evaluated can be implemented in bridge construction. However, further testing is needed to determine the number of pockets on the ; overhang panel—an issue critical to the constructability and economy of the system. This will be further addressed in report ; 0-6100-3.
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• Format:
  PDF
• Funding:
  Project 0-6100
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/18635/dot_18635_DS1.pdf
• File Type:
  [PDF - 11.94 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ede4f558c4659ef333af98af18c13e5b93883f1786fb845d2859a12efad807752d5c671c9f8a1c75e0a887d8f3d03100867ebfaf52f33648d8af3ffca7b7a5f6