Intent 1:
To limit the probability that the lower system will
be designed for lower forces than the upper system, which could lead
to a weaker lower level, which could lead to yielding in the less
ductile lower level, which could lead to:
- the excessive deformation of, or excessive stress in,
the structural elements, which could lead to damage to the building,
or
- the excessive deformation of, or excessive stress in,
the building structure, which could lead to damage to the building,
which could impede the intended use and occupancy of the building.
Intent 2:
To direct Code users to Sentence 4.1.8.9.(4), which addresses the values of RdRo.