Effect of Thermal Gradient on Ductility of Seismic Anchor
Publication: Journal of Structural Engineering
Volume 146, Issue 4
Abstract
In certain applications, a significant thermal gradient exists along the length of a seismic anchor. The yield strength of steel depends on temperature. Therefore, the strength of a steel anchor varies along its length. When pulled, the anchor yields at the weakest point and breaks before the yielding can spread to other parts. Localized yielding that results from a thermal gradient reduces the ductility of the anchor. This can reduce the overall ductility of the structure, and thus its resistance to seismic shaking. This article presents a method of computing the ductility of an anchor for a given thermal gradient. The article also presents a simple design improvement that increases the ductility of the anchor by a factor of 3. The anchors discussed in this study are expected to yield and elongate during rare earthquakes.
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Data Availability Statement
The following data are available from StrongMotions, Inc. by sending a written request at www.StrongMotions.com:
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The stress–strain curves for 9%Ni SS for various temperatures.
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The computer code for calculating the elongation capacity of an anchor strap.
Acknowledgments
The two reviewers of the manuscript are thanked for their specific suggestions to improve the value of this article. StrongMotions, Inc. is thanked for time, encouragement, and expert guidance.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Sep 6, 2018
Accepted: Sep 4, 2019
Published online: Jan 29, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 29, 2020
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