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.
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.