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原文传递 Tightening Procedures for Proper Installation of Anchor Rods in Ancillary Structures

题名：	Tightening Procedures for Proper Installation of Anchor Rods in Ancillary Structures
正文语种：	eng
作者：	Singh, Japsimran;Hebdon, Matthew H.
作者单位：	Walter P Moore & Associates Inc Diagnost 300 S Orange Ave 1200 Orlando FL 32801 USA;Virginia Tech Charles E Via Jr Dept Civil & Environm Engn Blacksburg VA 24060 USA
关键词：	Anchor rod;Pretension;Nut rotation;Nut loosening;Torque;Ancillary structures;Tightening procedures;Turn-of-the-nut
摘要：	In the last 2 decades, many ancillary structures have collapsed, with several instances traceable to loose anchor nuts. According to a quality assurance inspection conducted by the Virginia Department of Transportation (VDOT) in 2012, approximately 30% of the anchor nuts on the inspected ancillary structures across the state of Virginia were found to be loose. The exact cause of the loose anchor nuts is not known; however, one theory is that specified tightening procedures were not properly followed or were not adequate. Currently, a turn-of-the-nut method is used for the tightening of anchor nuts on double-nut moment connections at the base of ancillary structures. This research reviewed current tightening procedures for anchor nuts on ancillary structures. The relationship between three critical tightening parameters-applied torque, nut rotation, and pretension in the rod-was examined. One hundred galvanized steel anchor rods of five different diameters and three different grades were tested. The experimental tests serve as a benchmark to validate the current tightening procedures, as well as to recommend changes.
出版年：	2021
期刊名称：	Journal of structural engineering
卷：	147
期：	10