United States Department of Transportation
i
Investigation of high-strength bolt-tightening verification techniques.
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2016-03-01
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[PDF-1.19 MB]
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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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