Measures of Circularity for Shell Structures
Publication: Journal of Structural Engineering
Volume 137, Issue 10
Abstract
Most design codes for circular shell structures include a limit on out-of-round imperfections. However, commonly used measures of out-of-roundness fail to identify shapes that have constant diameter but are not circular. It is shown that out-of-roundness imperfections that take these forms can significantly affect the strength of nominally circular shell structures. An alternative measure of out-of-roundness is proposed that captures all out-of-round shapes, gives the same measure of out-of-roundness for elliptical structures as currently used measures, and is easy to apply.
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Acknowledgments
The author would like to acknowledge the helpful suggestions of Professor J. M. Rotter, who commented on a draft of this paper.
References
Abaqus. (2005). Abaqus users’ manual, Ver. 6.4, Pawtucket, RI.
European Committee for Standardization (CEN). (1999). “Design of steel structures, Part 1-6 general rules: Supplementary rules for shell structures.” Eurocode 3, Brussels, Belgium.
ISO. (1985). “Determining departures from roundness by measuring variations in radius.” 4291, Geneva.
Timoshenko, S. P., and Gere, J. (1961). Theory of elastic stability, 2nd Ed., McGraw Hill, New York.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 10 • October 2011
Pages: 1241 - 1243
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 6, 2009
Accepted: Oct 6, 2010
Published online: Nov 16, 2010
Published in print: Oct 1, 2011
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