| Damage state | Description | Associated performance level | Drift (from [2]) |
Displacement from pushover curve (from [23, 24]) |
Shear resistance criteria (from [5]) |
|---|---|---|---|---|---|
| DS1 | Negligible structural damage; low non-structural damage | Immediate occupancy | 1‰ | 0.7Δy | first pier attaining its maximum shear |
| DS2 | Minor structural damage and/or moderate non-structural damage | Damage limitation | 0.7Δy+5(Δu- 0.7Δy)/100 | weighted story drift equals value at the attainment of maximum base shear |
|
| DS3 | Significant structural damage and extensive non-structural damage. | Life safety | 3‰ | 0.7Δy+20(Δu-0.7Δy)/100 | 20% degradation in maximum base shear capacity |
| DS4 | Collapse; repairing the building is not feasible. | Collapse prevention | 5‰ | Δu | - |