Requirements for intermediate ring stiffeners placed below the ideal location on discretely supported shells

Date

2017-06-01

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

172
views

0
downloads

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 location and the stiffness and strength requirements for the intermediate ring stiffener placed at this location. In cases where a shell with a large radius rests on a few supports, the ideal location can be quite high and the option of placing the intermediate ring stiffener below the ideal location may provide a viable solution. This paper explores strength and stiffness requirements for intermediate ring stiffeners placed below the ideal location. Pursuant to this goal, the cylindrical shell below the intermediate ring stiffener is analyzed using the membrane theory of shells. The reactions produced by the stiffener on the shell are identified. Furthermore, the displacements imposed by the shell on the intermediate ring stiffener are obtained. These force and displacement boundary conditions are then applied to the intermediate ring stiffener 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 in the form of a simple algebraic expression is then developed by considering the ratio of the circumferential stiffness of the cylindrical shell to that of the intermediate ring stiffener. These analytical studies are then compared with complementary finite element analyses that are used to identify a suitable value for the stiffness ratio for ring stiffeners placed at different locations.

Subject Keywords

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

URI

https://hdl.handle.net/11511/34322

Journal

THIN-WALLED STRUCTURES

DOI

https://doi.org/10.1016/j.tws.2017.02.003

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Strength and stiffness requirements for intermediate ring stiffeners on discretely supported cylindrical shells Zeybek, Ozer; Topkaya, Cem; Rotter, J. Michael (2015-11-01) 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 ...
Analysis of silo supporting ring beams and intermediate ring stiffeners Zeybek, Özer; Topkaya, Cem; Department of Civil Engineering (2018) 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. 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. Another alternative is to use a combinati...
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...
Ideal Location of Intermediate Ring Stiffeners on Discretely Supported Cylindrical Shells Topkaya, Cem (American Society of Civil Engineers (ASCE), 2014-04-01) Silos in the form of a cylindrical metal shell are commonly elevated to provide access to the space beneath, permitting the contained materials to be directly discharged. A few discrete column supports at evenly spaced intervals are commonly used. However, the structural design of discretely supported cylindrical shells presents a variety of challenges. The presence of discrete supports results in circumferential nonuniformity in the axial compressive stress as well as a progressive vertical decay above the...
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, “Requirements for intermediate ring stiffeners placed below the ideal location on discretely supported shells,” THIN-WALLED STRUCTURES, pp. 21–33, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34322.