Behavior and design of large structural concrete bridge pier overhangs.

Details

• Creators:
  Armstrong, Scott D. ; Salas, Reuben M. ; Wood, Brad ; Breen, John E. ; Kreger, Michael E.
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  United States. Federal Highway Administration ; Texas. Dept. of Transportation
• Subject/TRT Terms:
  • Concrete bridges
  • Bridge piers
  • Strut and tie method
  • Flexural strength
  • Bridge repair
  • cantilever bridge piers
  • reinforced concrete bents
  • cantilever bents
• Publication/ Report Number:
  Report No. FHWA/TX-99/1364-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  In designing large cantilever bent caps for use on recent projects under current AASHTO design specifications, ; designers were faced with considerable uncertainties. Questions arose when designers attempted to satisfy ; both serviceability and strength requirements for a series of cap designs that mixed both non-prestressed and ; prestressed concrete solutions. The problems were complicated because of uncertainty whether AASHTO ; corbel or deep beam provisions would apply. The resulting designs were highly congested, had poor ; constructibility and high costs. ; This report outlines development of a new design approach involving use of strut-and-tie models (STM), as ; well as a mix of prestressed and non-prestressed main flexural reinforcement. A series of sixteen bent cap ; overhangs were designed, built at a reduced scale, and loaded to failure. Deflections, crack patterns and ; widths, reinforcement strains, and overall behavior were observed. Economic and constructibility issues were ; examined. The use ofT-headed anchorages was explored. ; A comprehensive design approach that considers both serviceability issues (deflections, cracking, crack ; widths, fatigue stress ranges, and side face crack control) and strength issues (ductility, adequacy of STM ; design and analysis of flexural capacity} was developed. Recommendations for design and detailing to ; improve behavior, reduce congestion and improve constructibility are provided.
  More +
• Format:
  PDF
• Funding:
  Research Study 0-1364
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31387/dot_31387_DS1.pdf
• File Type:
  [PDF - 5.45 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:50885e70c47285a2e23295b7d91f14a280cc80cdc5e0c610af522f367b6d992a