Stress analysis of ellipsoidal shell on an elastic foundation

The objective of this paper is the modeling of underground pipe in granular or sandy soil using a Pipe Stress Program for the evaluation of thermal, and pressure, to produce verifiable results. The use of a beam type pipe stress program to accurately perform stress analysis of underground piping can produce various results depending on the modeling. An updated presentation is available in B31.1 piping code with technical references, which gives some guidance in the use of pipe stress modeling. Modeling in a conservative way is difficult because what may be conservative to the underground piping may not be conservative at above ground transitions. An accurate methodology is required that produces verifiable results. Verification is accomplished by comparison with the B31.1 example problem and manual calculation using “Beam on Elastic Foundation”. Also discussed are the effects of SIF’s and flexibility factors used in above ground pipe and their application to underground piping. Ovalization of the piping is inhibited by the soil and the SIF’s and Flexibility factors are affected (pg 231) [1]. Recommendations are given in the conclusion for the accurate modeling using beam type pipe stress analysis programs.

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Stress analysis of ellipsoidal shell with radial nozzle

International Journal of Pressure Vessels and Piping ◽

10.1016/0308-0161(85)90042-0 ◽

1985 ◽

Vol 21 (2) ◽

pp. 89-108 ◽

Cited By ~ 10

Author(s):

Y.J. Chao ◽

M.A. Sutton

Keyword(s):

Stress Analysis ◽

Ellipsoidal Shell ◽

Radial Nozzle

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Stress Analysis of Ellipsoidal Shell With Nozzle Under Internal Pressure Loading

Journal of Pressure Vessel Technology ◽

10.1115/1.2929612 ◽

1994 ◽

Vol 116 (4) ◽

pp. 431-436 ◽

Cited By ~ 11

Author(s):

V. N. Skopinsky ◽

N. A. Berkov

Keyword(s):

Internal Pressure ◽

Stress Analysis ◽

Shell Theory ◽

Numerical Procedure ◽

Graphical Form ◽

Pressure Loading ◽

Ellipsoidal Shell ◽

Thin Shell Theory ◽

Purpose Computer ◽

Special Purpose Computer

This paper presents the numerical procedure for the stress analysis of the intersecting shells consisting of an ellipsoidal shell and nozzle. Thin shell theory and finite element method are used. The developed special-purpose computer program SAIS is employed for elastic stress analysis of the model joints of the ellipsoidal shell with nozzle. The parametric study of the joints under internal pressure loading was performed. The results are presented in graphical form. Nondimensional geometric parameters are considered to analyze the effects of changing these parameters on the maximum effective stresses in the shells.

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