December 13, 2010
|
RISA-3D,
Plates,
Loads,
RISA-2D
When
you
have
a
plate
model
for
a
slab
or
wall
in
RISA-3D,
the
Internal
Force
Summation
Tool
(IFST)
is
a
very
useful
analysis
tool
to
get
exactly
the
forces
that
you
want
to
design
for.
To
use
the
tool,
you
must:
Be
looking
at
the
model
in
a
plan
or
elevation
view
(i.e.
2D
View
only).
Have
selected
ONLY
the
portion
of
the
model
that
you
want
to
sum
the
forces
for
(all
other
elements
are
Un-selected).
Let’s
look
at
a
slab
example.
Here
we
have
an
elevated
slab
that
is
supported
on
all
edges,
with
a
column
that
lands
in
the
center
of
the
slab.
The
slab
is
modeled
with
plate
elements.
After
we
solve
the
model
for
that
load,
we
can
view
our
plate
contours
and
use
the
selection
tools
to
select
a
representative
strip.
The
representative
strip
would
be
a
strip
through
our
slab/wall
that
we
want
to
get
the
forces
for
so
we
can
then
design
reinforcement
for
this
strip.
To
use
the
IFST,
select
the
button
on
the
left
side
of
the
screen.
Clicking
twice
on
our
strip
will
create
a
plane
that
the
program
cuts
through
the
model
and
will
then
display
the…
