Selection

The 2D internal forces command serves for displaying internal forces on selected 2D members.

Usage

1. Calculate a FEM analysis of the model
2. Go to Tree > Results > 2D members > 2D internal forces
3. Set properties of the command to specify mainly:
   • selection of 2D members where the results are evaluated
   • load type from which the results are derived
   • specific result value from the available list to be visualized
4. Click on [Refresh] action button to display the results

 

Properties

 

Smoothing (averaging) of results

 

Location

 

Averaging of peaks

 

System of local

Note: To get general overview about how to work with Result service and its commands, see Results/Basics.

 

Values

The following categories of internal forces can be displayed:

Basic magnitudes

The basic internal forces are default magnitudes referring to the local axes of the selected coordination system.

Value	Description	Notes
mx	bending moment in direction of local axis x	1) As default, the internal forces refer to the local axes of the individual finite (mesh) elements. 2) The local axes can be displayed by selecting the corresponding option in the View parameters settings.
my	bending moment in direction of local axis y
mxy	torsional moment
vx	shear force in direction of local axis x
vy	shear force in direction of local axis y
nx	axial force in direction of local axis x
ny	axial force in direction of local axis y
nxy	in-plane shear force

Principal magnitudes

The principal internal forces represent the extreme values of the internal forces derived from the basic ones by transformation into the directions of principal axes:

Value	Description	Notes
m1	principal bending moment (max)	1) The angles of principal magnitudes are derived from to the local axis x. 2)The principal magnitudes can be visualized also as trajectories (see the option Trajectories in the command properties).
m2	principal bending moment (min)
ab	angle of principal bending moment m1
mtmaxb	maximum torsional moment
qmaxb	maximum shear force (from bending components)
bb	angle of maximum shear force qmaxb
n1	principal axial force (max)
n2	principal axial force (min)
am	angle of principal axial force n1
qmaxm	maximum in-plane shear force (from membrane components)

Elementary design magnitudes

Value	Description	Notes
mxD+	design moment in direction of local axis x on positive surface	1) The positive surface is considered on the side of positive local axis z while the negative surface is the opposite. 2)The surfaces of the 2D member can be easily swapped by changing the z axis orientation (see parameter Swap in 2D member property list)
myD+	design moment in direction of local axis y on positive surface

Resultant