ShellNLDKGT

This command is used to construct a ShellNLDKGT element. This element accounts for the geometric nonlinearity of large deformation using the updated Lagrangian formulation, which is developed based on the ShellDKGT element.

element ShellNLDKGT $eleTag $iNode $jNode $kNode $secTag

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eleTag	unique element object tag
iNode jNode kNode	three nodes defining element boundaries, input in clockwise or counter-clockwise order around the element.
	tag associated with previously-defined SectionForceDeformation object
secTag	currently can be a PlateFiberSection, a ElasticMembranePlateSection and a LayeredShell section

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Code developed by: Shuhao Zhang, Tsinghua University, and Prof. Xinzheng Lu, Tsinghua University