ShellNLDKGQ

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This command is used to construct a ShellNLDKGQ element object accounting for the geometric nonlinearity of large deformation using the updated Lagrangian formula, which is developed based on the ShellDKGQ element.

element ShellNLDKGQ $eleTag $iNode $jNode $kNode $lNode $secTag

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

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NOTE:

1. Three examples of this element can be found on the following URL

http://www.luxinzheng.net/download/OpenSEES/Examples_of_NLDKGQ_element.htm

References:

[1]	Lu XZ, Xie LL, Guan H, Huang YL, Lu X, A shear wall element for nonlinear seismic analysis of super-tall buildings using OpenSees, Finite Elements in Analysis & Design, 2015, 98: 14-25.

Code Developed by : Lisha Wang, Tsinghua University, Prof. Xinzheng Lu, Tsinghua University, Linlin Xie, Tsinghua University, Prof. Song Cen, Tsinghua University and Prof. Quan Gu, Xiamen University