Axial Compression Performance of Concrete-Filled Steel Tubular Columns with Different D/t Ratios

Table 2

Details of DOE (specimen details).

Test no.	Specimen designation	Response
		D/t ratio (X1)	Concrete strength (N/mm^2) (X2)	Actual strength capacity Nu, Exp (kN)	Predicted strength capacity Nu, proposed (kN)	(Nu, Exp)/Nu, proposed
1	CFST-31.83-50	31.83	50	1351	1334	1.045
2	CFST-25.46-50	25.46	50	1249	1161	1.013
3	CFST-25.46-50	25.46	50	1249	1161	1.076
4	CFST-21.22-60	21.22	60	1142	1070	1.076
5	CFST-25.46-50	25.46	50	1249	1161	1.067
6	CFST-25.46-50	25.46	50	1249	1161	1.076
7	CFST-31.83-40	31.83	40	1270	1238	1.076
8	CFST-21.22-50	21.22	50	1057	1067	1.026
9	CFST-25.46-50	25.46	50	1249	1161	0.991
10	CFST-25.46-35	25.46	35	1100	1031	1.076
11	CFST-21.22-40	21.22	40	1037	1067	1.067
12	CFST-31.83-60	31.83	60	1450	1418	0.972
13	CFST-25.46-60	25.46	60	1402	1256	1.023
Mean						1.039
Standard deviation (SD)						0.031
Coefficient of variance (COV)						0.029