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Modal response spectrum analysis

Modal response spectrum analysis

(OP)
Dear experts

Regarding to the calculation of the response spectrum parameter as per UBC-97 item 1631.2 and 1631.5.4 the elastic response spectrum should be divided by (R/g) but in ASCE-05 item 12.9.2 the elastic response spectrum should be divided BY (R/I),and the different between two values is very high for example
UBC value =4.5/9.81 =0.459
ASCE value =4.5/1.2 =3.75
My question is there any item in ASCE code mentioned that we should take the effect of the (g) acceleration in the calculation of the response spectrum.

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