December 27, 2013
|
New,
RISAConnection
For
moment
connections
in
RISAConnection
there
is
an
option
to
place
web
doubler
plates
on
the
column
web.
These
plates
act
as
a
reinforcement
for
the
column
web
to
prevent
panel
zone
shear
failure.
As
shown
below,
when
the
flanges
of
a
beam
in
a
moment
connection
connect
to
a
column
they
form
a
force
couple
which
causes
the
column
to
kink.
If
the
column
web
is
too
thin
to
handle
that
kink
then
it
will
fail
through
tearing
or
buckling.
In
order
to
prevent
this
failure
on
connections
which
have
a
high
amount
of
panel
zone
shear
you
can
use
web
doubler
plates.
These
plates
are
applied
directly
to
the
web,
and
welded
all
around.
When
using
these
plates
they
are
considered
to
increase
the
column
web
thickness,
which
in
turn
increases
the
panel
zone
shear
capacity
significantly.
As
an
engineer
be
sure
to
use
these
web
doublers
only
when
absolutely
necessary
though.
They
are
very
expensive
to
fabricate,
and
often
a
design
featuring
a
column
with
a
thicker
web
is
ultimately
cheaper…
