response spectrum case data 9etabs prgramm0

huangyhg

response spectrum case data (etabs prgramm)
hello everybody
i use ubc 97 and aci 318-99 metric unit
my question is what is the right way to calcualte the scle factor in response spectra in etab programm?
my fined advice me to make that
at the first floor divide the base shear of eqx/base shear or spexcx to get the secale factor
after that multiply the scale factor x 9.81 and put this value in the response spectrum case data after that run the modal again
but iam doubt in that.
i wish to find the right answer here
check out our whitepaper library.
no one have answer
just confrim that steps to me to be refrece3 for me