Tightening Procedures for Large-Diameter Anchor Bolts

James, R. W.; Keating, P. B.; Bolton, R. W.; Benson, F. C.; Bray, D. E.; Abraham, R. C.; Hodge, J.B.

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Tightening Procedures for Large-Diameter Anchor Bolts

1996-12-01
By James, R. W. ; Keating, P. B. ; Bolton, R. W.

File Language:

English

[PDF - 14.73 MB]

Details

Creators:

James, R. W. ; Keating, P. B. ; Bolton, R. W. ; Benson, F. C. ; Bray, D. E. ; Abraham, R. C. ; Hodge, J.B.
Corporate Creators:

Texas Transportation Institute. Texas A&M University
Corporate Contributors:

Texas. Dept. of Transportation. Research and Technology Transfer Office ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

FHWA/TX-98/1472-lF
Resource Type:

Tech Report
Geographical Coverage:

Texas ; United States
Edition:

Final Report: September 1994-August 1996
Corporate Publisher:

Texas Transportation Institute. Texas A&M University
Abstract:

Recent failures of cantilever overhead sign structures in Michigan and elsewhere, coupled with the absence of standards for tightening methods for the double-nut system used with large-diameter anchor bolts in similar structures in Texas have been the motivation for this study. Practices of various field offices were reviewed, a literature study was performed, and both laboratory studies and field studies were performed. Three questions were raised: How tight do the anchor bolt nuts need to be? What techniques and procedures are best suited for tightening? How can tightness best be inspected? Standards for tightening procedures for large-diameter anchor bolts are proposed. In current TxDOT practice, the contractor is left to his or her own judgment concerning how tight to tighten the nuts on the double-nut anchor bolt system. Recent bolt failures in other states have raised concerns about nut tightening procedures. When the nuts of a double-nut system are not tightened sufficiently, fatigue loading, and even impact loading, can be factors in the performance of the bolts.
Format:

PDF
Funding:

0-1472
Download URL:

https://rosap.ntl.bts.gov/view/dot/82899/dot_82899_DS1.pdf
File Type:

[PDF - 14.73 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:6e5da10ae597859dc1686be43b02e6af6d4bd63f2c84cd21abcf9fb4c288b975321b6db3d546748ad3d6ed0a1f17355aa7a277c00ce298cae7ee0655bf9e5902

File Language:

English

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