Development of precast bridge deck overhang system : technical report.

Details

• Alternative Title:
  Project title: Development of precast bridge deck overhang system
• Creators:
  Trejo, David ; Kim, Young Hoon
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• 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-11/0-6100-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2007-Aug. 2009.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  The implementation of full-depth, precast overhang panel systems has the potential to improve constructability, ; productivity, and make bridges more economical. Initial testing and analyses reported in the 0-6100-2 report resulted in ; a design that required a large number of shear pockets in the overhang panels. The general design methodology used in ; this report was to determine the number of connectors based on the shear capacity of a girder with conventional R-bars ; (not necessarily based on the required demand). The large number of shear pockets reduced the constructability and ; economy of the precast overhang system. Report 0-6100-1 (produced after 0-6100-2) used the American Association of ; State Highway Officials Load and Resistance Factor Design (AASHTO LRFD 2008) demand requirements to design ; the number of shear pockets for a precast overhang panel system and reported that the number of pockets per panel could ; be reduced from the numbers reported in report 0-6100-2. However, this report only included an analysis for one beam ; type and one span length. In addition, the demand load used did not include all factors typically used by designers. ; Additional testing was required to assess different connector systems and further analyses were needed for the new Texas ; Department of Transportation (TxDOT) girders. The testing and analyses documented in this report (0-6100-3) provides ; a new equation for determining the number of shear pockets required for the various shear connector/coupler systems ; evaluated in this research. This equation was used to determine the number of shear pockets required for the newer ; TxDOT girders. Results from this research indicate that the roughened surface provides strong adhesion between the top ; girder surface and a precast panel. Steel reinforcing hoops placed in the shear pocket and shear reinforcing hoops placed ; in the overhang panel around the opening of the shear pocket provided limited or no improvement in capacity of the ; shear connector/coupler system. Hollow structural section (HSS) steel tubes placed around the perimeter of the shear ; pocket during fabrication did result in samples with higher shear capacities and could result in overhang panels with ; fewer shear pockets. This system could make constructing bridges with precast overhang systems more constructible, ; economical, and could reduce the construction time.
  More +
• Format:
  PDF
• Funding:
  Project 0-6100
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23041/dot_23041_DS1.pdf
• File Type:
  [PDF - 1.18 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:a183f23447855b62ef03b6cee30037a927c3aa92812250e750c92a31b7bfc6288e5d55be35fc17d4b7e0bc1f66bd2ed58a7801ca0e97b51ee42ba9a67c3536b6