Measures of Circularity for Shell Structures

M. Gillie

Research output: Contribution to journalArticlepeer-review


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. DOI: 10.1061/(ASCE)ST.1943-541X.0000348. (C) 2011 American Society of Civil Engineers.

Original languageEnglish
Pages (from-to)1241-1243
Number of pages3
JournalJournal of Structural Engineering
Issue number10
Publication statusPublished - Oct 2011


  • Shell structures
  • Out-of-roundness
  • Imperfection
  • Buckling


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