The Prediction of Steel Bar Corrosion Based on BP Neural Networks or Multivariable Gray Models

Table 2

The practical engineering data (Liaoning Benxi and Shanxi steel plant).

Data group	η (mm)	ω (mm)	fcu (MPa)	c (mm)	d (mm)
1	6.84	0.18	21.21	15	22
2	14.51	0.25	21.63	17	20
3	24.53	0.333	26.58	30	18
4	35.64	0.667	29.86	30	22
5	15.7	0.5	22.34	55	30
6	4	0.75	31.76	14	30
7	35.3	0.667	21.21	30	25
8	14.8	1.1	25.68	15	20
9	18.6	0.667	20.31	12	25
10	21.1	0.667	23.88	16	25
11	7.04	0.85	18	17.3	12
12	9.6	2	18	15.4	12
13	4.2	1.8	18	12.1	12
14	10.92	0.5	18	14.8	12
15	9.7	0.5	20	20	8
16	14.45	0.225	20	20	8
17	7.33	0.3	20	40	12
18	8.52	0.35	10	20	12
19	6.37	0.25	20	10	12
20	6.72	1.15	18	15.7	12
21	4.88	0.3	20	20	12
22	21.2	0.7	28.21	30	25
23	13.1	0.5	22.31	33.5	30
24	7.44	0.2	21.21	20	20
25	20.6	1	21.64	30	28
26	14.05	0.6	30.54	18	12
27	7.68	0.9	18	13.1	12
28	8.32	1.5	18	11.7	12
29	5.85	0.3	20	20	16