...
Moment-curvature
...
curves
...
may
...
be
...
obtained
...
for
...
a
...
given
...
section
...
and
...
axial
...
load
...
through
...
the
...
following
...
process:
...
- Create
...
- the
...
- section
...
- using
...
- the
...
...
...
- .
...
- Select
...
- Display
...
- >
...
- Show
...
- Moment-Curvature
...
- Curve
...
- to
...
- display
...
- the
...
- moment-curvature
...
- curve
...
- for
...
- a
...
- default
...
- axial
...
- force
...
- of
...
- zero
...
- (Figure
...
- 1).
...
- Enter
...
- the
...
- desired
...
- axial
...
- force
...
- (P),
...
- then
...
- select
...
- Refresh
...
- to
...
- generate
...
- the
...
- curve
...
- for
...
- a
...
- specific
...
- axial
...
- load.
Figure 1 - Moment-curvature
...
curve
Neutral-axis
...
location
...
Angle
...
(Deg)
...
specifies
...
the
...
orientation
...
of
...
the
...
neutral
...
axis,
...
measured
...
counterclockwise
...
from
...
the
...
negative
...
3
...
axis,
...
as
...
shown
...
in
...
Figure
...
2.
...
Moment-curvature
...
formulation
...
then
...
determines
...
the
...
location
...
of
...
the
...
neutral
...
axis.
...
Neutral-axis
...
location
...
is
...
measured
...
along
...
an
...
orthogonal
...
projection
...
from
...
the
...
neutral
...
axis
...
to
...
the
...
section
...
centroid.
Figure 2 - Neutral-axis location