Field Performance of Abutment Tiebacks

Details

• Creators:
  Whitworth, Paul ; Bang, Sangchul
• Corporate Creators:
  South Dakota School of Mines and Technology
• Corporate Contributors:
  South Dakota. Department of Transportation. Office of Research
• Subject/TRT Terms:
  Abutments Bridges Maintenance Sill Tiebacks
• Publication/ Report Number:
  SD90-07-F
• Resource Type:
  Tech Report
• Geographical Coverage:
  South Dakota ; United States
• Edition:
  Final Report May, 1990 to May, 1996
• Corporate Publisher:
  South Dakota. Department of Transportation. Office of Research
• Abstract:
  The South Dakota Department of Transportation has experienced problems with rotation of sill type bridge abutments resulting in abutment backwalls jamming against the ends of girders and bridge decks. A sill tieback system to prevent displacement and rotation of bridge abutments has been designed for use in new construction and abutment retrofitting. 1l1e tieback system consists of a series of drilled.in concrete anchors placed behind an abutment backwall. Sleeves are cast in the anchors and abutment backwalls to allow threaded rods to be passed through and locked off at a predetermined tension. In an earlier project, software was developed defining tieback system design parameters using finite element analysis. This software, called BART, uses soil and foundation survey information and bridge design parameters as input. Because the design parameters produced by the software are theoretical, there was a desire to verify its accuracy. This project was initiated to monitor actual loads and movement on newly constructed sill tieback systems for comparison of predictions from the design program. 1l1e research results indicated that for the structures tested, adequate correlation could be seen. In addition, there was interest in developing a simple method for monitoring tension in each tie rod as an integrity test of sill tieback systems. A method was established whereby measuring the torque of the lock-off nut with a torque/load can be estimated by comparing the values obtained with a torque/load chart included in this report.
• Format:
  PDF
• Funding:
  310199
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:776858378242eee53e2752159631d007d8e59eb3dc8dacb814fdb3d0d185b5c19772556bc2ae7e7e8cd8f1e0bc71a3d75d69589476a30dc1bc0def7e6c241f9d
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/80141/dot_80141_DS1.pdf
• File Type:
  [PDF - 3.74 MB ]