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The reduced design spectral acceleration SaR (T)a, which is the ordinate of the reduced design acceleration spectrum for a given natural vibration period T, used to determine the reduced seismic loads in the horizontal direction, is that of Sa Sa Horizontal Elastic Design Spectrum (ASCE 7-16), is obtained by dividing the R, Reduced Design Acceleration Spectrum for Modal Analysis and multiply with Ie.
On the Analysis ASCE 7-16 Wizard - Design Spectra tab, the spectral acceleration coefficients obtained from USGB based on the coordinates and the horizontal elastic design spectrum Sa Sa is calculated according to the formula below . Horizontal Elastic Design Spectrum (ASCE 7-16), it is represented by a total of 4 functions, different in each region, and shown with the graph below.
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According to the structural system type, using the R, Cd Cd and Ωo coefficients obtained from Table 12.2-1, R/Ie (Ta)and the reduced design spectral acceleration are calculated automatically. |
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