From: Modified spectral format based on probability level using site-specific uniform hazard spectrum
Spectrum | Values of Modifiers | Influence of modification factors on \( {C}_{sm}^{\ast } \) distribution | |
---|---|---|---|
0.9 ≤ \( {C}_{sm}^{\ast } \) ≤ 1.5 | \( {C}_{sm}^{\ast } \) < 0.9 | ||
Period range 1: 0 to 0.5 s | |||
 2%/50-yr NBCC spectrum | F0.2 = F0.5 = F1.0 = F2.0 = 1.0 | 51.3% | 16.7% |
 Modified spectrum | F0.2 = 0.8, F0.5 = 1.1, F1.0 = 1.5, F2.0 = 4.0 | 57.9% | 21.3% |
Period range 2: 0.5 to 1.0 s | |||
 2%/50-yr NBCC spectrum | F0.2 = F0.5 = F1.0 = F2.0 = 1.0 | 42.2% | 43.5% |
 Modified spectrum | F0.2 = 0.8, F0.5 = 1.1, F1.0 = 1.5, F2.0 = 4.0 | 51.4% | 18.2% |
Period range 3: 1.0 to 2.0 s | |||
 2%/50-yr NBCC spectrum | F0.2 = F0.5 = F1.0 = F2.0 = 1.0 | 13.5% | 72.2% |
 Modified spectrum | F0.2 = 0.8, F0.5 = 1.1, F1.0 = 1.5, F2.0 = 4.0 | 61.7% | 7.9% |
Period range 4: 2.0 to 4.0 s | |||
 2%/50-yr NBCC spectrum | F0.2 = F0.5 = F1.0 = F2.0 = 1.0 | 11.2% | 85.4% |
 Modified spectrum | F0.2 = 0.8, F0.5 = 1.1, F1.0 = 1.5, F2.0 = 4.0 | 45.1% | 3.5% |
Period range 5: 4.0 to 5.0 s | |||
 2%/50-yr NBCC spectrum | F0.2 = F0.5 = F1.0 = F2.0 = 1.0 | 11.1% | 85.4% |
 Modified spectrum | F0.2 = 0.8, F0.5 = 1.1, F1.0 = 1.5, F2.0 = 4.0 | 45.6% | 3.5% |