Strength and stiffness requirements for intermediate ring stiffeners on discretely supported cylindrical shells

Date

2015-11-01

Author

Zeybek, Ozer
Topkaya, Cem
Rotter, J. Michael

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

227
views

0
downloads

Silos in the form of a cylindrical metal shell are often supported on a ring beam which rests on discrete column supports. This support condition produces a circumferential non-uniformity in the axial membrane stresses in the silo shell. One way of reducing the non-uniformity of these stresses is to use a very stiff ring beam which partially or fully redistributes the stresses from the local support into uniform stresses in the shell. A better alternative is to use a combination of a flexible ring beam and an intermediate ring stiffener. Recent research by the authors has identified the ideal location of the intermediate ring stiffener to provide circumferentially uniform axial membrane stresses above the stiffener. To be fully effective, this intermediate ring should locally prevent both radial and circumferential displacements in the shell. This paper explores the strength and stiffness requirements for this intermediate ring stiffener. Pursuant to this goal, the cylindrical shell below the intermediate ring stiffener is analysed using the membrane theory of shells and the reactions produced by the stiffener on the shell are identified: These reactions are then applied to the intermediate ring stiffener. Vlasov's curved beam theory is used to derive closed form expressions for the variation of the stress resultants around the circumference to obtain a strength design criterion for the stiffener. A stiffness criterion is then developed by considering the ratio of the circumferential stiffness of the cylindrical shell to that of the intermediate ring stiffener. The circumferential displacements of the ring and the shell are found for the loading condition previously obtained to determine the required strength. A simple algebraic expression is developed for this intermediate ring stiffness criterion. These analytical studies are then compared with complementary finite element analyses that are used to identify a suitable value for the intermediate ring stiffness ratio for practical design.

Subject Keywords

Tanks, Cylindrical shells, Closed form solutions, Stiffening, Supports, Silos

URI

https://hdl.handle.net/11511/40154

Journal

THIN-WALLED STRUCTURES

DOI

https://doi.org/10.1016/j.tws.2015.08.004

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Requirements for intermediate ring stiffeners placed below the ideal location on discretely supported shells Zeybek, Ozer; Topkaya, Cem; Rotter, J. Michael (2017-06-01) Silos in the form of a cylindrical metal shell are commonly supported by a few discrete columns to permit the contained materials to be directly discharged. The discrete supports produce a circumferential non-uniformity in the axial membrane stresses in the silo shell. A combination of a ring beam and an intermediate ring stiffener can be used for large silos to redistribute the stresses from the local support into uniform stresses in the shell. Previous work done by the authors has identified the ideal loc...
Analysis of silo supporting ring beams resting on discrete supports Zeybek, Ozer; Topkaya, Cem; Rotter, J. Michael (Elsevier BV, 2019-02-01) Elevated cylindrical metal silos are often supported on a ring beam which rests on discrete column supports. The ring beam plays an important role in redistributing the majority of the discrete forces from the column supports into a more uniform stress state in the cylindrical wall, which is necessary to reduce the potential for buckling of the shell wall.
Buckling of cylindrical metal shells on discretely supported ring beams Sonat, Cem; Topkaya, Cem; Rotter, J. Michael (2015-08-01) Silos in the form of cylindrical metal shells are usually supported on evenly spaced columns in applications where an access space is needed for the discharge of contained solids. In large silos a ring beam is used to distribute the column forces into the shell. The presence of discrete supports results in a circumferential non-uniformity of axial stresses in the shell. This non-uniformity leads to high local stresses that must be considered in assessing the possibility of shell buckling. Design standards p...
Stiffness requirements for wind girders in open-top cylindrical steel tanks Zeybek, Özer; Topkaya, Cem (2022-07-01) © 2022 Elsevier LtdAboveground cylindrical storage tanks are very thin shell structures which are prone to buckling when subjected to wind pressure. Both external and internal pressures are developed due to wind action, and the magnitudes of the pressures generally vary around the circumference. A wind girder is generally used in open-top cylindrical tanks to increase their resistance against buckling. The wind girder must have adequate strength and stiffness in order to fulfill its function properly. Widel...
Buckling of cylindrical metal shells resting on discretely supported ring beams Sonat, Cem; Topkaya, Cem; Department of Civil Engineering (2013) Silos in the form of cylindrical metal shells can be supported by evenly spaced columns in applications where an access space is needed for discharge of contained solids. In large silos a ring beam is utilized to more evenly distribute the column forces into the shell. The presence of discrete supports results in a non-uniformity of meridional stresses around the circumference. The stress non-uniformity must be taken into account in assessing the stability of the shell. Design standards provide recommendati...

Citation Formats

O. Zeybek, C. Topkaya, and J. M. Rotter, “Strength and stiffness requirements for intermediate ring stiffeners on discretely supported cylindrical shells,” THIN-WALLED STRUCTURES, pp. 64–74, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40154.