Table II.

Optimal Discrete and Brickwork Designs of Tube 1 and theirs corresponding stiffness from Fea and Experiment

		Design 1		Design 2		Design 3		Design 4		Brickwork
Design Variable	$\alpha$ (degs)	−8.5		−7.7		−11.5		−15		5
	$\beta$ (degs)	15.7		12.7		17.8		16		N/A
	$\theta$ (degs)	68.74		68.74		68.74		45		N/A
	gap (mm)	2.02		1.4		2.07		0.865		N/A
	h (mm)	0.21		0.2		0.2		0.21		0.2
	n	6		4		6		4		N/A
	n	4		4		6		4		4
Results		FEA	Exp.	FEA	Exp.	FEA	Experiment	FEA	Experiment	FEA	Experiment
	$EI\left(Nm{m}^2\right)$	1076	1119.6	1035	1095.8	1100	1219.3	1104	1187.8	1003	978.5
	$GJ(Nm{m}^2)$	12748	13566.2	12303	11761.4	10734	11097.5	10643	11114.1	8035	8688.6
	$AE\left(N\right)$	2226	1824	1235	1005.3	2326	1796.1	1019	1099.3	1012	965.4