Table 8 Comparison of statistical analyses results between AASHTO and modified AASHTO spectra
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 | – | 34.8% | 59.3% |
 Modified AASHTO spectrum | F0.2 = 1.3, F1.0 = 3.0, k = 0.75 | 55.7% | 10.7% |
Period range 2: 0.5 to 1.0 s | |||
 AASHTO spectrum | – | 11.6% | 85.6% |
 Modified AASHTO spectrum | F0.2 = 1.3, F1.0 = 3.0, k = 0.75 | 42.3% | 3.8% |
Period range 3: 1.0 to 2.0 s | |||
 AASHTO spectrum | – | 4.2% | 94.1% |
 Modified AASHTO spectrum | F0.2 = 1.3, F1.0 = 3.0, k = 0.75 | 43.4% | 5.5% |
Period range 4: 2.0 to 4.0 s | |||
 AASHTO spectrum | – | 2.6% | 96.9% |
 Modified AASHTO spectrum | F0.2 = 1.3, F1.0 = 3.0, k = 0.75 | 44.1% | 9.3% |
Period range 5: 4.0 to 5.0 s | |||
 AASHTO spectrum | – | 2.3% | 97.2% |
 Modified AASHTO spectrum | F0.2 = 1.3, F1.0 = 3.0, k = 0.75 | 42.9% | 5.7% |