Research Article
Identification of Sudden Stiffness Change in the Acceleration Response of a Nonlinear Hysteretic Structure
Table 3
Identification results of the simulated structure subjected to the different earthquake excitation in different cases.
| Case | Seismic excitation | k1 (N/m) | k2 (N/m) | ζ1 (%) | ζ2 (%) | Y (mm) | α | β | γ | n |
| S1 | (a) El-Centro earthquake | 102.45 | 102.73 | 1.86 | 2.06 | 46.46 | 0.09 | 0.55 | 0.52 | 2.06 | (b) Kobe earthquake | 102.79 | 102.73 | 2.12 | 1.83 | 47.38 | 0.10 | 0.56 | 0.57 | 1.95 | (c) Northridge earthquake | 103.01 | 102.58 | 1.96 | 1.98 | 49.60 | 0.10 | 0.61 | 0.61 | 1.97 |
| S2 | (a) El-Centro earthquake | 103.15 | 102.46 | 2.09 | 2.16 | 44.13 | 0.11 | 0.47 | — | 2.01 | (b) Kobe earthquake | 102.65 | 102.74 | 2.12 | 1.82 | 44.65 | 0.10 | 0.49 | — | 1.96 | (c) Northridge earthquake | 101.46 | 103.09 | 2.38 | 2.09 | 45.19 | 0.10 | 0.46 | — | 2.07 |
| S3 | (a) El-Centro earthquake | 102.86 | 102.70 | 2.03 | 2.24 | 44.70 | — | 0.48 | — | 2.01 | (b) Kobe earthquake | 103.13 | 102.71 | 2.15 | 1.84 | 44.39 | — | 0.48 | — | 1.93 | (c) Northridge earthquake | 102.72 | 103.01 | 2.28 | 2.05 | 44.71 | — | 0.46 | — | 1.97 |
| S4 | (a) El-Centro earthquake | 103.06 | 102.55 | 2.08 | 2.17 | 47.78 | 0.11 | 0.55 | 0.61 | — | (b) Kobe earthquake | 102.54 | 102.73 | 2.16 | 1.84 | 47.62 | 0.10 | 0.56 | 0.58 | — | (c) Northridge earthquake | 102.94 | 102.65 | 2.16 | 2.01 | 46.23 | 0.10 | 0.52 | 0.56 | — |
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