...
How
...
are
...
initial
...
free-vibration
...
conditions
...
applied
...
to
...
the
...
beginning
...
of
...
a
...
time-history
...
analysis?
...
Extended
...
Question:
...
I
...
am
...
interested
...
in
...
subjecting
...
a
...
SAP2000
...
model
...
to
...
an
...
initial
...
displacement
...
and
...
velocity
...
at
...
the
...
start
...
of
...
a
...
time-history
...
analysis.
...
Is
...
this
...
possible
...
and
...
how
...
would
...
it
...
be
...
done?
...
Answer:
...
The
...
initial
...
conditions
...
of
...
a
...
time-history
...
...
...
may
...
either
...
be
...
zero,
...
or
...
may
...
continue
...
from
...
the
...
end
...
of
...
a
...
previous
...
...
analysis.
...
Initial
...
free-vibration
...
conditions
...
would
...
have
...
to
...
be
...
induced
...
in
...
the
...
previous
...
case
...
before
...
that
...
state
...
carries
...
over
...
into
...
the
...
...
...
analysis
...
.
...