ShellNL

This command is used to construct a ShellNL element, a lagrangian nine-noded shell element.

element ShellNL $eleTag $node1 $node2 ... $node9 $secTag

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eleTag	unique element object tag
node1 … node9	nine nodes defining element boundaries, input is the typical, firstly four corner nodes counter-clockwise, then mid-side nodes counter-clockwise and finally the central node.
secTag	tag associated with previously-defined SectionForceDeformation object. Currently must be either a PlateFiberSection, or ElasticMembranePlateSection

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NOTE:

The valid queries to a Quad element when creating an ElementRecorder are ‘forces’, ‘stresses,’ and

material $matNum matArg1 matArg2 ...

Where $matNum refers to the material object at the integration point corresponding to the node numbers in the isoparametric domain.

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Examples

set t 10.0 
model basic -ndm 3 -ndf 6 
nDMaterial ElasticIsotropic 1 200000 0.3 
nDMaterial PlateFiber 2 1 
section PlateFiber 3 2 $t 
element ShellNL 1 1 27 29 3 14 28 16 2 15 3

References

Zienkiewicz o.c., Taylor r.l. vol. 2. The finite element method. Solid mechanics. Elsevier 2000

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Code Developed by: Leopoldo Tesser, Diego A. Talledo