To limit the probability that stiff elements that are not
considered part of the Seismic Force Resisting System will be subject to loads
for which they were not designed, which could lead to:
- stiffening of the structure, which could lead to a change in
the dynamic characteristics of the building structure (natural period and
mode shapes), which could lead to an increase in the inertial forces in the
building structure, and
- inadequate strength in the stiff elements.
This is to limit the probability of structural
failure of the stiff elements and the Seismic Force Resisting System, which
could lead to harm to persons.