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In the second stage, analysis is made using only the masses of the lower section. (R alt / I) = 2.5 and D alt = 1.5 are used in the calculation. However, since T = 0 assumption is made , the earthquake load reduction coefficient calculated from TBDY Equation (4.1) for the subsection will always be (R a ) sub = D alt = 1.5. As a result of the calculation for the second loading case, the reduced internal forces in the lower section are obtained.
ideCAD Statik uses this account automatically only for irregularity calculations .
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