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Dear fellows, i have some queries regarding UBC code and and IBC-2003. I am carrying out study study in Saudi Arabia, Comparative study for Saudi Arabia maximum and minimum earthquake zones based on UBC and SBC(IBC-2003). As there is no provision for SBC or IBC in Etabs so I calculated base shear by hand.(see attached files).Maximum earthquake zoning of Saudi Arabia is 2B according to old SBC(was based on UBC) and S1= 12.6 % and Ss = 43.7 % of g, according to new SBC(based on IBC-2003). There is big difference in values of base shear and lateral forces in both codes. Please check the files attached. Can any body suggest and guide me about these results. (Region 4 in SBC = zone 1 in UBC and Region 6 = Zone 2B in SBC) Also It is right way to calculate Ss=43.7/100 * 9.81 = 4.26 (which is very big) ? UBC.docx SBC.docx
