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Table 3 Comparison between Run 1 and Run 4 for 2%/50-yr 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

 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%