Table 6-1
Allowable Story Drift, ? a (in. or mm)
Performance Level
Structure
1
2
3
0.025 hsx b
Structures, other than masonry shear wall or masonry
0.020 hsx
0.015 hsx
wall frame structures, four stories or less in height
with interior walls, partitions, ceilings, and exterior
wall systems that have been designed to accommodate
the story drifts
Masonry cantilever shear wall structures c
0.010 hsx
0.010 hsx
0.010 hsx
Other masonry shear wall structures
0.007 hsx
0.007 hsx
0.007 hsx
Masonry wall frame structures
0.013 hsx
0.013 hsx
0.010 hsx
All other structures
0.020 hsx
0.015 hsx
0.010 hsx
a
hsx is the story height below Level x.
b
There shall be no drift limit for single-story structures with interior walls, partitions, ceilings, and exterior
wall systems that have been designed to accommodate the story drifts.
c
Structures in which the basic structural system consists of masonry shear walls designed as vertical
elements cantilevered from their base or foundation support which are so constructed that moment transfer
between shear walls (coupling) is negligible.
6-2
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