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This is Fig. 1 from the 2010 GENOPT paper, "Use of GENOPT and BIGBOSOR4 to optimize weld lands in axially compressed stiffened cylindrical shells and evaluation of the optimized designs by STAGS" by David Bushnell and Robert P. Thornburgh, AIAA 51st Structures, Structural Dynamics, and Materials Conference, 2010, AIAA Paper 2010-2927.
This slide shows an example in which there are T-stiffened weld lands spaced at intervals of 60 degrees. Optimized designs are obtained via a combination of GENOPT and BIGBOSOR4. (drawing by Robert P. Thornburgh)
See the "GENOPT" slide show for many examples of optimization by GENOPT in which BIGBOSOR4 is the structural analyzer.
In this application of BIGBOSOR4 to a cylindrical shell with T-stiffened weld lands the true prismatic model introduced into BIGBOSOR4 in 2010 is used.
Reference for the "true prismatic" shell model incorporated recently (2010) into BIGBOSOR4:
Bushnell, David, "Comparison of a "huge torus" model with a true prismatic model for: 1. an axially compressed simple monocoque cylindrical shell, 2. an axially compressed optimized truss-core sandwich cylindrical shell, and 3. an axially compressed optimized internally ring and stringer stiffened cylindrical shell with a T-stiffened weld land, Unpublished report for NASA Langley Research Center, February 12, 2010 and contained in the file, ...bigbosor4/case/prismatic/prismaticshell.pdf
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