Parametric Updating of Steel Strand Stay Cable Force Calculation Model Based on Response Surface Method

Table 4

CCD test design scheme of S7 cable.

Sample number	Code of parameters in CCD test
	X (bending stiffness)	Y (calculated length)	Z (unit weight)
1	0	0	−1.68
2	0	0	0
3	−1.68	0	0
4	1	−1	−1
5	0	0	0
6	0	1.68	0
7	1	−1	1
8	0	0	0
9	0	0	0
10	−1	1	−1
11	0	0	0
12	1	1	−1
13	−1	−1	−1
14	1.68	0	0
15	1	1	1
16	−1	1	1
17	0	−1.68	0
18	0	0	1.68
19	−1	−1	1
20	0	0	0