Table 5 Comparison between Run 1 and Run 2 for AASHTO spectrum
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 | |||
 AASHTO Spectrum | F0.2 = F0.5 = k = 1.0 | 34.8% | 59.3% |
 Modified AASHTO Spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 48.8% | 37.2% |
Period range 2: 0.5 to 1.0 s | |||
 AASHTO Spectrum | F0.2 = F0.5 = k = 1.0 | 18.7% | 85.6% |
 Modified AASHTO Spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 42.1% | 22.1% |
Period range 3: 1.0 to 2.0 s | |||
 AASHTO Spectrum | F0.2 = F0.5 = k = 1.0 | 7.7% | 94.1% |
 Modified AASHTO Spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 37% | 27.4% |
Period range 4: 2.0 to 4.0 s | |||
 AASHTO Spectrum | F0.2 = F0.5 = k = 1.0 | 2.6% | 96.9% |
 Modified AASHTO Spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 39.4% | 30.0% |
Period range 5: 4.0 to 5.0 s | |||
 AASHTO Spectrum | F0.2 = F0.5 = k = 1.0 | 2.3% | 97.2% |
 Modified AASHTO Spectrum | F0.2 = 1.0, F1.0 = 2.5, k = 0.75 | 37.1% | 27.0% |