Review Article
Survey on Major Worldwide Regulations on Seismic Base Isolation of Buildings
Table 9
Site effects (the USA) in the short period range [
12,
22].
| | Soil type/SS | Fa | | ≤0.25 | = 0.5 | = 0.75 | = 1.0 | = 1.25 | >1.25 | ≥1.5 |
| | A | 0.8/0.8 | 0.8/0.8 | 0.8/0.8 | 0.8/0.8 | 0.8/0.8 | 0.8/N.A. | N.A./0.8 | | B | 1.0/0.9 | 1.0/0.9 | 1.0/0.9 | 1.0/0.9 | 1.0/0.9 | 1.0/N.A. | N.A./0.9 | | C | 1.2/1.3 | 1.2/1.3 | 1.1/1.2 | 1.0/1.2 | 1.0/1.2 | 1.0/N.A. | N.A./1.2 | | D | 1.6/1.6 | 1.4/1.4 | 1.2/1.2 | 1.1/1.1 | 1.0/1.0 | 1.0/N.A. | N.A./1.0 | | E | 2.5/2.4 | 1.7/1.7 | 1.2/1.3 | 0.9/ | 0.9/ | 0.9/N.A. | N.A./ |
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