Table 6 Comparison between Run 2 and Run 3 for modified AASHTO spectrum with 5%/50-yr hazard maps
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 | |||
 Modified AASHTO spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 48.8% | 37.2% |
 Modified AASHTO spectrum | F0.2 = 1.2, F1.0 = 3.0, k = 0.75 | 55.6% | 16.3% |
Period range 2: 0.5 to 1.0 s | |||
 Modified AASHTO spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 42.1% | 22.1% |
 Modified AASHTO spectrum | F0.2 = 1.2, F1.0 = 3.0, k = 0.75 | 43.6% | 4.2% |
Period range 3: 1.0 to 2.0 s | |||
 Modified AASHTO spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 37% | 27.4% |
 Modified AASHTO spectrum | F0.2 = 1.2, F1.0 = 3.0, k = 0.75 | 43.5% | 5.5% |
Period range 4: 2.0 to 4.0 s | |||
 Modified AASHTO spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 39.4% | 30.0% |
 Modified AASHTO spectrum | F0.2 = 1.2, F1.0 = 3.0, k = 0.75 | 44.1% | 9.3% |
Period range 5: 4.0 to 5.0 s | |||
 Modified AASHTO spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 37.1% | 27.0% |
 Modified AASHTO spectrum | F0.2 = 1.2, F1.0 = 3.0, k = 0.75 | 42.9% | 5.7% |