February 15, 2011
|
RISA-3D,
RISA-2D,
New,
Boundary Conditions
In
RISA-3D,
there
are
numerous
options
for
Member
End
Releases
which
should
not
be
confused
with
Boundary
Conditions.
End
releases
are
used
to
define
how
elements
connected
to
each
other.
For
example,
End
Releases
are
used
to
define
whether
a
beam
is
carrying
moment
into
a
column.
You
can
define
the
Member
End
Release
when
you
create
the
member
or
you
can
click
on
the
member
and
review
the
I
End
and
J
End
Release
Codes
in
the
Properties
Panel
by
selecting
the
three
dots
to
the
right
of
the
empty
fields.
Each
member
has
six
force
components
at
each
end
(axial,
y-y
&
z-z
shear,
torque,
and
y-y
&
z-z
bending).
A
good
rule
of
thumb
for
connections
in
steel
beams:
Fully
Fixed
(Moment
connection)
=
Both
the
Flanges
and
the
Web
are
connected
Bending
Moment
Released
(Shear
connection)
=
Only
the
Web
is
connected
Boundary
conditions
define
the
EXTERNAL
support
conditions
for
your
model.
For
example,
a
steel
frame
sits
on
a
foundation
and
the
Boundary
Condition
defines
how
the
loads
get
transferred
to
the
foundation.
You
define
the
restraint
for
X,
Y,
and
Z
translations
and
X,
Y
and
Z
rotations
with
reactions,
fixed
or
springs.
(For…
