Sign Convention

In AdSec the section is considered to be in the y-z plane as illustrated below

This means that moments are defined as follows:

The following table illustrate moment, compression and curvature conventions

$\mathrm{M}_{\mathrm{yy}}$	$\mathrm{M}_{\mathrm{zz}}$	Moment angle, $\theta$	Neutral Axis angle, $\theta_{\mathrm{NA}}$	$\kappa_{y y}$	$\kappa_{z z}$	Diagram
+M	0	0	0	+ ve	0
+M	+M	$-45^{\circ}$	$-45^{\circ}$	+ve	+ve
0	+M	$-90^{\circ}$	$-90^{\circ}$	0	+ve
-M	+M	$-135^{\circ}$	$-135^{\circ}$	- ve	+ve
-M	0	$-180^{\circ}$ $\left(180^{\circ}\right)$	$-180^{\circ}$, $\left(180^{\circ}\right)$	- ve	0
-M	-M	$135^{\circ}$	$135^{\circ}$	- ve	- ve
0	-M	$90^{\circ}$	$90^{\circ}$	0	- ve
+M	-M	$45^{\circ}$	$45^{\circ}$	+ ve	- ve

Key: C = Region of Compression M = Any particular moment NA = Neutral Axis