November 29, 2010
|
RISA-3D,
Results,
Diaphragms,
New
When
using
rigid
diaphragm
analysis
in
RISA-3D
it
can
be
useful
to
evaluate
the
story
shear
in
each
frame.
This
is
a
perfect
application
for
the
Internal
Force
Summation
Tool.
The
first
step
is
to
solve
the
desired
load
combination.
Next,
select
one
of
the
braced
frames
in
the
model
and
using
the
selection
tools
on
the
far
left
side
of
the
3D
window,
turn
off
the
unselected
parts
of
the
model
to
show
only
the
frame
which
you
are
interested
in.
Next,
snap
the
model
into
an
elevation
view
of
the
frame
in
order
to
make
the
next
step
easier.
Click
on
the
"sigma"
icon
(Internal
Force
Summation
Tool)
below
the
selection
toolbar
and
then
click
on
two
joints
of
the
frame
that
are
at
the
same
elevation
to
define
a
horizontal
cutting
plane.
Once
the
cutting
plane
is
defined
(by
clicking
the
second
joint)
you
can
slide
the
plane
up
and
down
your
frame
to
select
the
vertical
location
of
your
cutting
plane.
Click
a
third
time
for
a
dialog
box
which
explains
what
each
force
is.
Here,
F1
represents
the
story
shear…
