[190622] Shell - Cantilever Plate Eigenvalue Problem

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Output Parameter	Model and Mesh	OpenBrIM	SAP2000	Independent	Percent Difference (SAP2000 vs Independent)	Percent Difference (OpenBrIM vs Independent)
Period Mode 1 (sec)	A 10 x 10	0.01743	0.01743	0.01723	+1.2%	1.15373%
	B 20 x 20	0.01743	0.01737		+0.8%	1.15373%
	C 40 x 40	0.01743	0.01735		+0.7%	1.15373%
Period Mode 2 (sec)	A 10 x 10	0.01737	0.00717	0.00704	+1.8%	59.46495%
	B 20 x 20	0.01737	0.00710		+0.9%	59.46495%
	C 40 x 40	0.01737	0.00708		+0.6%	59.46495%
Period Mode 3 (sec)	A 10 x 10	0.01735	0.00288	0.00281	+2.5%	83.80552%
	B 20 x 20	0.01735	0.00284		+1.1%	83.80552%
	C 40 x 40	0.01735	0.00283		+0.7%	83.80552%
Period Mode 4 (sec)	A 10 x 10	A4:	0.00228	0.00219	+4.1%	A4;
	B 20 x 20	B4:	0.00223		+1.8%	B4;
	C 40 x 40	C4:	0.00222		+1.4%	C4;
Period Mode 5 (sec)	A 10 x 10	A5:	0.00200	0.00193	+3.6%	A5;
	B 20 x 20	B5:	0.00196		+1.6%	B5;
	C 40 x 40	C5:	0.00195		+1.0%	C5;