The Effects of Bolt Over-Tightening on Bolted Connections

by Edwin R. Schmeckpeper, Univ of Idaho, Moscow, United States,
Richard J. Nielsen, Univ of Idaho, Moscow, United States,
Guy Gentry, Univ of Idaho, Moscow, United States,

Document Type: Proceeding Paper

Part of: Structures Congress XII


This paper describes a portion of the research program being conducted on structural connectors which have been over-tightened. Direct-Tension Indicators (DTI) may be specified for use on high strength bolts to verify that the bolts are properly tensioned. The gap in the DTI is measured to determine if the bolts have been sufficiently tensioned. This research was initiated at the request of the Idaho Transportation Department in order to resolve questions concerning the use of bolts with Direct-Tension Indicators (DTI) which have been tightened to nil gap.

Subject Headings: Bolted connections | Tension members | Connections (structural) | Material tests | Bolts | Structural behavior | Strength of materials

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