Simplified procedure for design of liquid-storage combined conical tanks

Amr M.I. Sweedan, Ashraf A. El Damatty

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Steel vessels in the form of combined conical-cylindrical shells are commonly used for liquid storage in elevated water tanks. A number of such tanks collapsed in different places around the globe due to instability of the steel shells. An essential cause of those collapses is the lack of adequate design procedures for such structures. In this study, a simplified design approach is developed to ensure safety of hydrostatically loaded combined steel conical tanks against buckling. The study is conducted numerically using a non-linear finite element model that accounts for the effects of large deformations and geometric imperfections on the stability of combined conical tanks. The finite element results together with a non-linear regression analysis are used to develop magnification functions that relate the overall shell stresses to the membrane stresses which can be evaluated analytically. Numerical examples are presented to explain application of the suggested design approach.

Original languageEnglish
Pages (from-to)750-759
Number of pages10
JournalThin-Walled Structures
Issue number6-7
Publication statusPublished - Jun 2009


  • Buckling
  • Combined tanks
  • Conical tanks
  • Finite element
  • Stability
  • Steel

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering


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