Investigation of High-Strength Bolt-Tightening Verification Techniques, RB07-014

(2016) Investigation of High-Strength Bolt-Tightening Verification Techniques, RB07-014. Transportation, Department of


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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.

Item Type: Departmental Report
Note: This record contains links to the 51 page full report as well as the 3 page Tech Transfer Summary. The summary is not deposited separately.
Keywords: Bolts, Bridges, High strength, Implementation, Nondestructive tests, Pretensioning, State of the Art, State of the practice, bolt tightening, high-strength bolts, verification
Subjects: Transportation
Transportation > Materials
Transportation > Bridges and tunnels
Transportation > Design and Construction
ID Code: 21889
Deposited By: Leighton Christiansen
Deposited On: 05 Apr 2016 15:06
Last Modified: 05 Apr 2016 15:06