Response Spectrum Base Shear Scale

Dear All,

I have modelled and analysed a staad model with response spectrum analysis and the scale factor i have matched still im getting this. some one please clarify regarding this

NOTE : THE BASE SHEAR (VB) FROM RESPONSE SPECTRUM IS LESS THAN THE
BASE SHEAR (Vb) CALCULATED USING EMPIRICAL FORMULA FOR FUNDAMENTAL
TIME PERIOD. MULTIPLYING FACTOR (Vb/VB) ACCORDING TO 7.7.3a IS 1.0000

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