Research Article

Nonlinear Regression Based Health Monitoring of Hysteretic Structures under Seismic Excitation

Table 4

Effect of threshold chosen on identification results.

Preyielding stiffness (KN/m)Viscous damping (KNs/m)Yield deformation (mm)Bilinear factor

True2730052146.50.065

Threshold = 0.09 m
 Mean2738046439.20.284
 Coefficient of variation0.0070.1740.3561.581
 Mean error0.3%10.9%15.7%336.9%

Threshold = 0.10 m
 Mean2737146846.70.079
 Coefficient of variation0.0070.1760.0100.702
 Mean error0.3%10.2%0.4%21.5%

Threshold = 0.11 m
 Mean2733548247.00.062
 Coefficient of variation0.0100.2240.0080.008
 Mean error0.1%7.5%1.1%4.6%

Threshold = 0.12 m
 Mean2733548247.00.061
 Coefficient of variation0.0100.2240.0080.008
 Mean error0.1%7.5%1.1%6.2%

Threshold = 0.13 m
 Mean2733548247.00.061
 Coefficient of variation0.0100.2240.0080.008
 Mean error0.1%7.5%1.1%6.2%