Stress Measurement of Steel Strands Based on System Identification Method

Table 2

Identification model parameters in different tension force.

Stress	Parameter
	0.2 fpk	−2.525	1.977	−0.042	−0.476	−0.171	0.521	−0.316	0.068	−0.057	0.060
0.3 fpk	−2.491	1.955	−0.158	−0.364	−0.075	0.348	−0.205	0.030	−0.083	0.082
0.4 fpk	−2.518	2.083	−0.358	−0.249	−0.088	0.278	−0.056	−0.046	−0.118	0.110
0.5 fpk	−2.558	2.22	−0.493	−0.286	0.057	0.181	−0.043	0.005	−0.170	0.124
0.6 fpk	−2.653	2.546	−0.852	−0.226	0.241	−0.123	0.346	−0.332	0.016	0.069
0.7 fpk	−2.656	2.652	−1.111	−0.013	0.223	−0.161	0.261	−0.143	−0.124	0.106