...
Generalized
...
displacements
...
are
...
user-defined
...
displacement
...
measures
...
which
...
are
...
useful
...
for
...
output
...
data
...
and
...
monitoring
...
...
analysis.
...
Translational
...
or
...
rotational
...
displacements
...
from
...
one
...
or
...
more
...
...
are
...
scaled
...
and
...
summed
...
to
...
generate
...
generalized-displacement
...
values.
...
For
...
example,
...
story
...
drift
...
may
...
be
...
defined
...
as
...
DRIFTX
...
and
...
measured
...
as
...
the
...
difference
...
in
...
UX
...
displacement
...
between
...
vertically
...
aligned
...
points
...
on
...
adjacent
...
floors.
...
Average
...
values
...
may
...
also
...
be
...
obtained
...
by
...
scaling
...
x
...
displacements
...
by
...
1/x.
...
Additional
...
information
...
is
...
presented
...
in
...
the
...
...
...
...
(Generalized
...
Displacements).
...