March 10, 2016
|
Seismic,
Time History,
Dynamics,
RISA-3D,
New
The
Pacific
Earthquake
Engineering
Research
center
(PEER)
has
a
large
library
of
measured
earthquake
records.
Below
is
an
example
of
how
to
quickly
convert
one
of
these
records
into
a
format
that
can
be
imported
into
RISA.
PEER
Earthquake
Record
The
main
header
indicates
the
information
is
for
the
Northridge
earthquake
measured
in
a
particular
direction
at
a
particular
station.
This
is
then
followed
by
information
that
gives
the
total
number
of
records
(5200)
and
the
time
step
(0.01
sec)
between
each
record.
The
units
are
of
g
which
is
what
RISA
expects
so
it’s
not
necessary
to
specify
a
multiplier.
However,
for
clarity
the
RISA
input
file
specifies
a
multiplier
of
1.0
for
clarity.
RISA
Time
History
Input
File
In
the
PEER
txt
file,
the
header
name
is
very
long
so
we’ll
use
an
abbreviated
name
in
the
RISA
file:
“NORTHRIDGE
090”.
The
time
step
of
0.01
seconds
and
number
of
records
per
line
(5)
needs
to
be
specifically
entered
as
shown
below.
One
important
difference
is
that
the
original
PEER
file
lists
the
total
number
of
data
points
whereas
the
RISA
import
lists
the
number
of
lines
of
data,
not
the
total
number
of
records.
Because
we
have…
