Table 6.

Ductility evaluation of deflection.

Specimens	$\mathbf{Yield}\left({\mathbf{P}}_{\mathit{y}}\right)$		$\mathbf{Ultimate}\left({\mathbf{P}}_{\mathit{u}}\right)$		Ductility Index
	Load (kN)	Displacement (mm)	Load kN)	Displacement (mm)
R4C	143.1	18.85	163.5	82.68	4.39
R2C	134.4	21.84	155.4	159.87	7.32
R4NSP	256.4	27.97	337.7	155.98	5.58
R2NSP	200.1	28.44	229.5	110.16	3.87
R2NSN(H)	158.8	25.01	180.1	50.61	2.02
R2NSN(S)	154.2	25.11	206.9	99.84	3.98
R4EPP	270.0	24.94	291.4	39.93	1.60
R2EPP	214.3	25.72	252.5	46.05	1.79
R4EBN	194.6	24.41	232.0	44.49	1.82
R2EBN	216.4	27.87	287.7	53.40	1.92
R2SEN	210.1	24.15	243.9	96.63	4.00