Using the coefficients obtained from the map, the spectrum curve is automatically made with Equation 11.9-1, 11.9-2, 11.9-3 and 11.9-4 by the program.

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


SYMBOLS

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


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

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

For vertical periods greater than 0.025 s and less than or equal to 0.05 s, SaMv is determined with eq. 11.9-2.

For vertical periods greater than 0.05 s and less than or equal to 0.15 s, SaMv is determined with eq. 11.9-3.

For vertical periods greater than 0.15 s and less than or equal to 2.0 s, SaMv is determined eq. 11.9-4.

Vertical coefficient, Cv is determined according to Table 11.9-1 with using straight-line interpolation for intermediate values.

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