Investigation of high-strength bolt-tightening verification techniques.

Details

• Creators:
  Phares, Brent M. ; Lee, Yoon-Si ; Brockman, Tim ; Rooney, Jessica
• Corporate Creators:
  Iowa State University. Bridge Engineering Center
• Corporate Contributors:
  Iowa. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bolts
  • Bridges
  • Inspection
  • Nondestructive tests bolt tightening
  • high-strength bolts
  • non-destructive evaluation
  • pretension
  • verification
• Publication/ Report Number:
  InTrans Project 14-501
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  Iowa. Dept. of Transportation
• Abstract:
  The current means and methods of verifying that high-strength bolts have been properly tightened are very laborious and time ; consuming. In some cases, the techniques require special equipment and, in other cases, the verification itself may be somewhat ; subjective. While some commercially available verification techniques do exist, these options still have some limitations and ; might be considered costly options. ; The main objectives of this project were to explore high-strength bolt-tightening and verification techniques and to investigate the ; feasibility of developing and implementing new alternatives. A literature search and a survey of state departments of ; transportation (DOTs) were conducted to collect information on various bolt-tightening techniques such that an understanding of ; available and under-development techniques could be obtained. During the literature review, the requirements for materials, ; inspection, and installation methods outlined in the Research Council on Structural Connections specification were also reviewed ; and summarized. To guide the search for finding new alternatives and technology development, a working group meeting was ; held at the Iowa State University Institute for Transportation October 12, 2015. During the meeting, topics central to the research ; were discussed with Iowa DOT engineers and other professionals who have relevant experiences.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30683/dot_30683_DS1.pdf
• File Type:
  [PDF - 1.19 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:9dcac9cabbb7ff5a8ddb82116d2c9d3932369622e438ea92dd25a173885185348b808793e259ace55047cd328cc1303ec4edf77a4ec0a43f4b7a1101ec72493e