How does ideCAD define horizontal elastic design spectrum, according to ASCE 7-16?
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SYMBOLS
Fa = Short-Period Site Coefficient
Fv = Long-Period Site Coefficient for a period of 1.0 seconds
SMS = Short-period design spectral response acceleration parameter [dimensionless]
SM1 = Design spectral response acceleration parameter for a period of 1.0 seconds [dimensionless]
SS = the mapped MCER spectral response acceleration parameter at short periods as determined in accordance with Section 11.4.2,
S1 = the mapped MCER spectral response acceleration parameter at a period of 1 s as determined in accordance with Section 11.4.2
SD1 = Design spectral response acceleration parameter for a period of 1.0 seconds
SDS = Design earthquake spectral response acceleration parameters at short periods
T = Natural vibration period [s]
T0 =Horizontal elastic design acceleration spectrum corner period [s]
TS = Horizontal elastic design acceleration spectrum corner period [s]
TL = Transition period to constant displacement region in horizontal elastic design spectrum [s]
Sa = Horizontal elastic design spectral acceleration [ g]
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Horizontal elastic design spectral accelerations Sa, are defined in terms of gravity [g] depending on the natural vibration period.
With the spectral response acceleration parameters obtained from USGS depending on the coordinates, the horizontal elastic design spectrum Sa isdetermined according to the formula below. It is represented by a total of 4 functions, different in each region. It’s It is shown in the graph below.
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In the Analysis Settings - Response Spectrum Function tab, the horizontal design spectrum is determined and showed by shown using the design spectral response acceleration parameters.
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