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 |
| True | 27300 | 521 | 46.5 | 0.065 |
| Threshold = 0.09 m | | | | | Mean | 27380 | 464 | 39.2 | 0.284 | Coefficient of variation | 0.007 | 0.174 | 0.356 | 1.581 | Mean error | 0.3% | 10.9% | 15.7% | 336.9% |
| Threshold = 0.10 m | | | | | Mean | 27371 | 468 | 46.7 | 0.079 | Coefficient of variation | 0.007 | 0.176 | 0.010 | 0.702 | Mean error | 0.3% | 10.2% | 0.4% | 21.5% |
| Threshold = 0.11 m | | | | | Mean | 27335 | 482 | 47.0 | 0.062 | Coefficient of variation | 0.010 | 0.224 | 0.008 | 0.008 | Mean error | 0.1% | 7.5% | 1.1% | 4.6% |
| Threshold = 0.12 m | | | | | Mean | 27335 | 482 | 47.0 | 0.061 | Coefficient of variation | 0.010 | 0.224 | 0.008 | 0.008 | Mean error | 0.1% | 7.5% | 1.1% | 6.2% |
| Threshold = 0.13 m | | | | | Mean | 27335 | 482 | 47.0 | 0.061 | Coefficient of variation | 0.010 | 0.224 | 0.008 | 0.008 | Mean error | 0.1% | 7.5% | 1.1% | 6.2% |
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