NBC 2020 弹性底板剪力设计，Ve，系数

Additional factor to be applied to the design elastic base shear, V_e, according to NBC 2020

Max (\frac{2 S (0.2)}{3 S (T_{a})} \leq 1.0, \frac{S (0.5)}{S (T_{a})} \leq 1.0)

S(0.2)	Design spectral response acceleration for a period of T = 0.2 sec
S(0.5)	Design spectral response acceleration for a period of T = 0.5 sec
S(T_a)	Design spectral response acceleration for the fundamental lateral period of vibration of the structure in the direction under consideration

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