Vertical Elastic Design Spectrum per ASCE 7-16 with ideCAD

How does ideCAD define vertical elastic design spectrum, according to ASCE 7-16?

Using the coefficients obtained from the map, the vertical elastic spectrum curve is automatically calculated.

The design vertical response spectral acceleration, S_av, is taken as two-thirds of the value of S_aMv.

SYMBOLS

S_MS = The MCE_R spectral response acceleration parameter at short periods
S_aMv = The vertical response spectral acceleration
S_av = The design vertical response spectral acceleration
T_v = The vertical period of vibration. [s]
C_v = is defined in terms of S_S in Table 11.9-1

With the spectral response acceleration parameters obtained from USGS depending on the coordinates, the vertical response spectrum S_aMv is calculated according to the formula below.

For vertical periods less than or equal to 0.025 s, S_aMv is determined with Eq. 11.9-1.

For vertical periods T>0.025 s and T≤0.05 s, S_aMv is determined with Eq. 11.9-2.

For vertical periods T>0.05 s and T≤0.15 s, S_aMv is determined with Eq. 11.9-3.

For vertical periods T>0.15 s and T≤2.0 s, S_aMv is determined Eq. 11.9-4.

The vertical coefficient, C_v, is determined according to Table 11.9-1 using straight-line interpolation for intermediate values.

Values of Vertical Coefficient C_v

S_s	Site Class A, B	Site Class C	Site Class D, E, F
S_s ≥ 2.0	0.9	1.3	1.5
S_s = 1.0	0.9	1.1	1.3
S_s = 0.6	0.9	1.0	1.1
S_s = 0.3	0.8	0.8	0.9
S_s ≤ 0.2	0.7	0.7	0.7

The design vertical response spectral acceleration, S_av, is taken as two-thirds of the value of S_aMv.

Next Topic

ASCE 7-16 Seismic Design Code General Principles.

Related Topics