How ideCAD defines the seismic design category, according to ASCE 7-16?
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Seismic design categories of buildings are determined automatically according to Table 11.6-1 and 11.6-2, depending on the SDS and SD1 parameters defined in 11.5 and the risk category. |
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SD1 = Long period design spectral response acceleration parameter for 1 s
SDS =Short period design spectral response acceleration parameter
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The Seismic design category is determined automatically based on the short-period design spectral response acceleration parameter and long-period design spectral response acceleration parameter defined in 11.4.5 with risk category by the programideCAD software.
SDS | I or II or III | IV |
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SDS < 0.167 | A | A |
0.167 ≤ SDS < 0.33 | B | C |
0.33 ≤ SDS < 0.50 | C | D |
0.50 ≤ SDS | D | D |
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SD1 | I or II or III | IV |
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SDS < 0.067 | A | A |
0.067 ≤ SDS < 0.133 | B | C |
0.133 ≤ SDS < 0.20 | C | D |
0.20 ≤ SDS | D | D |
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