Figure 2-2. Earthquake Input Excitation is Defined by Maximum Ground Acceleration

DOE-STD-1020-2002

For PC-1 and PC-2 facilities IBC/USGS maps should be used for ground motion unless

there are special reasons to conduct site-specific studies. However, use of any site specific

results shall conform to the limits established in the IBC 2000.

It should be understood that the spectra shown in Figure 2-2 or in-structure spectra developed

from them represent inertial effects. They do not include differential support motions, typically

called seismic anchor motion (SAM), of structures, equipment, or distribution systems supported

at two or more points. While SAM is not usually applicable to building design, it might have a

significant effect on seismic adequacy of equipment or distribution systems.

Figure 2-2. Earthquake Input Excitation is Defined by Maximum Ground Acceleration

Anchoring Site-Specific Response Spectra.

2-3