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This page is devoted to frequently asked questions (FAQ) related to shells. |
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Formulation
What is the difference between thick and thin shells?
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- Wilson, E. L. (2004). Static and Dynamic Analysis of Structures (4th ed.). Berkeley, CA: Computers and Structures, Inc.
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How does the software apply stiffness modifiers to shell objects?
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Extended Question: I have an area object with more than four vertices for which meshing is not specified. However, this object is meshed in the analysis model. How was this mesh created?
Answer: CSI Software uses a general meshing tool to mesh objects with more than four nodes when no auto-meshing has been assigned.
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Answer: If the four points do not lie in a plane, an area object cannot be drawn because the profile is warped. Instead of using four-sided shells, these areas may be drawn using triangles.
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How are shells merged with the sides of frame objects?
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- Use insertion points to offset the frames from the shells.
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Loading and output
What is the difference between the load assignments Uniform (Shell) and Uniform to Frame (Shell)?
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- Uniform to Frame (Shell) – uniform loading is applied directly to the frame objects specified along the edges of a shell. Load distribution may be one way or two way. Distribution of loading may be reviewed through Display > Show Load Assigns > Area.
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VERIFY |
How can I post-process the bridge-diaphragm area-object output to obtain meaningful design forces?
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Figure 2 - Shell-section layer definition
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