Effects of Over-Tightening High-Strength Bolts Used in Bolted Connections inBridges

摘要

This report describes the research program conducted on high-strength bolts andconnectors that have been over-tightened. Direct-tension indicators (DTI) may be specified for use on high-strength bolts to verify that 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 installed with DTI which had been tightened to zero gap readings.