Effect of Uneven Standoff Distances on the Axial Force Resistance of Anchor Bolt Connections
Publication: Practice Periodical on Structural Design and Construction
Volume 22, Issue 4
Abstract
A stiffness-based approach founded on the moment-distribution method evaluated the effect of uneven standoff distances in double-nut anchor-bolt connections on the axial-resistive forces provided by the anchor bolts in response to connection loads. The uneven condition affected the intensity and distribution of resistive forces as determined when analyzed within the framework of the anchor-bolt group. The relative axial stiffness and proximity of the anchor bolts to the center of rigidity of the group were the major contributors. Comparisons with finite-element analysis showed close agreement for anchor-bolt configurations with even, uneven, and excessive standoff distances. The developed approach is comprehensive and applicable for various standoff distances, numbers, spacings, and sizes of anchor bolts. The approach is valid for fatigue-level (or greater) loads provided anchor-bolt stress does not exceed the elastic limit and the base plate supplies rigid diaphragm action.
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Acknowledgments
The work described in this document culminated from research sponsored by the Alabama Department of Transportation (ALDOT) Project 930-683, titled “Design of Overhead Sign Structures for Fatigue Loads,” and the National Center for Transportation Systems Productivity and Management (NCTSPM) and ALDOT cosponsored project, titled “Evaluation of Anchor Bolt Clearance Discrepancies.” It is important to acknowledge other participants of the project, including Fouad H. Fouad, Ph.D., P.E., Chair and Professor of the Department of Civil, Construction and Environmental Engineering at the University of Alabama at Birmingham (Primary Investigator of Project 930-683) as well as the hard work and dedication of the ALDOT Maintenance Bureau.
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Information & Authors
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Published In
Practice Periodical on Structural Design and Construction
Volume 22 • Issue 4 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Dec 19, 2016
Accepted: May 22, 2017
Published online: Aug 8, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 8, 2018
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