Buckling of cylindrical metal shells resting on discretely supported ring beams

Download

index.pdf

Date

2013

Author

Sonat, Cem

Metadata

Show full item record

Item Usage Stats

178
views

61
downloads

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 recommendations for buckling of shells under uniform compression while being silent for providing solutions for non-uniform stresses. Designers have to resort to onerous finite element analysis which includes geometric and material nonlinearities with imperfections (GMNIA). A parametric study has been undertaken to develop a family of resistance curves which can be directly used in design without the need for complicated analysis. The resistance curves depend on the plastic resistance and elastic buckling resistance. Simple algebraic equations were developed to represent the plastic and elastic buckling resistances which were obtained using material nonlinear analysis (MNA) and linear bifurcation analysis (LBA), respectively. The proposed methodology is based entirely on hand calculations except for finding the degree of non-uniformity in the meridional stresses, which can be determined using linear finite element analysis.

Subject Keywords

Shells (Engineering)., Elastic plates and shells., Finite element method., Cylinders., Silos.

URI

http://etd.lib.metu.edu.tr/upload/12616194/index.pdf
https://hdl.handle.net/11511/22674

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

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...
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 ...
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...
Thermal convection in the presence of a vertical magnetic field Guray, E.; Tarman, H. I. (Springer Science and Business Media LLC, 2007-11-01) The interaction between thermal convection and an external uniform magnetic field in the vertical is numerically simulated within a computational domain of a horizontally periodic convective box between upper and lower rigid plates. The numerical technique is based on a spectral element method developed earlier to simulate natural thermal convection. In this work, it is extended to a magnetoconvection problem. Its main features are the use of rescaled Legendre-Lagrangian polynomial interpolants in expanding...

Citation Formats

C. Sonat, “Buckling of cylindrical metal shells resting on discretely supported ring beams,” M.S. - Master of Science, Middle East Technical University, 2013.