How does ideCAD define vertical elastic design spectrum, according to ASCE 7-16?
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SMS = The MCER spectral response acceleration parameter at short periods
SaMv = The vertical response spectral acceleration
Sav = The design vertical response spectral acceleration
Tv = The vertical period of vibration. [s]
Cv = is defined in terms of SS in Table 11.9-1
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For vertical periods less than or equal to 0.025 s, SaMv is determined with eqEq. 11.9-1.
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For vertical periods greater than 0T>0.025 s and less than or equal to 0T≤0.05 s, SaMv is determined with eqEq. 11.9-2.
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For vertical periods greater than 0T>0.05 s and less than or equal to 0T≤0.15 s, SaMv is determined with eqEq. 11.9-3.
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For vertical periods greater than 0T>0.15 s and less than or equal to 2T≤2.0 s, SaMv is determined eqEq. 11.9-4.
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The vertical coefficient, Cv, is determined according to Table 11.9-1 with using straight-line interpolation for intermediate values.
Values of Vertical Coefficient Cv
Ss | Site Class A, B | Site Class C | Site Class D, E, F |
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Ss ≥ 2.0 | 0.9 | 1.3 | 1.5 |
Ss = 1.0 | 0.9 | 1.1 | 1.3 |
Ss = 0.6 | 0. |
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9 | 1.0 | 1.1 | |
Ss = 0.3 | 0.8 | 0.8 | 0.9 |
Ss ≤ 0.2 | 0.7 | 0.7 | 0.7 |
The design vertical response spectral acceleration, Sav, is taken as two-thirds of the value of SaMv.
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