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A shell is a three or four-node area object used to model membrane and plate-bending behavior. Shell objects are useful for simulating floor, wall, and bridge deck systems; 3D curved surfaces; and components within structural members, such the web and flanges of a W-Section.

Shells may be homogeneous or layered throughout their thickness. Temperature-dependent, orthotropic, and nonlinear material properties may be assigned to layered shells. Layered shells will exhibit localization of nonlinear behavior. Shells may be assigned edge constraints, and may be loaded in any direction, along any side.

Full shell behavior and the Mindlin-Reissner thick-plate formulation are recommended for analysis. Additional options and details are discussed in the CSI Analysis Reference Manual (Homogeneous and Layered, page 159).




Create circular openings

Circular openings may be created within area objects, and the surrounding mesh may be improved.


Modeling simply supported shells

Procedure for modeling simply supported shells and coordinating their support systems.


Radial point load

Application of point loads in the radial direction using the Advanced Joint Coordinate Axes feature.


Test Problems


Frame to shell connections

This tutorial describes the application of connections between frame and shell elements.


Influence surface

Influence-surface verification for a cantilever beam modeled using shell objects.


Options for applying area loads

Uniform (Shell), one-way Uniform to Frame (Shell), and two-way Uniform to Frame (Shell) load application to shell objects and associated meshing procedures.