Review Article
Survey on Major Worldwide Regulations on Seismic Base Isolation of Buildings
Table 16
Parameters of the isolators (minimum/nominal/maximum) for the hospital buildings.
| | Los Angeles | New Mexico | NRB | LRB | NRB | LRB |
| Diameter (mm) | 500 | 600 | 450 | 450 | Rubber layer height (mm) | 5 | 6 | 5 | 5 | Rubber height (mm) | 125 | 250 | 110 | 180 | Lead core diameter (mm) | — | 90 | — | 60 | Rubber shear modulus (MPa) | 0.392 | 0.385 | 0.392 | 0.385 | Lateral initial stiffness (kN/m) | 616/677/800 | 5867/5867/5867 | 567/623/737 | 5585/5585/5585 | Yielding force (kN) | — | 54.91/60.40/71.38 | — | 26.70/29.30/34.71 | Lateral after-yield stiffness (kN/m) | — | 451/496/587 | — | 430/473/559 | Vertical stiffness (kN/m) | 1228 | 1106 | 1043 | 811 | Effective design stiffness (kN/m) | 515 | 715 | 567 | 738 | Effective damping (%) | — | 20.38 | — | 25 |
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