A model of (30*30) m 40-story building was created with
steel columns, beams and sections of 0.2m width concrete
slab. The steel superstructure had a lateral system of special
concentrically braced frames (SCBF) in both the transverse
and longitudinal directions, and that structural system was
used for both of the fixed-base and isolated-base buildings
designed for this study. Building place was assumed to be in
Cairo and according to USGS worldwide seismic design tool
[8] it was found that response spectrum parameters were
0.5815g and 0.3395g for SDS and SD1 respectively, 0.509g
and 0.872g for SM1 and SMS respectively