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SkyCiv Structural 3D

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Shear, Moment, Torsion and Axial

Reviewing Shear, Moment, Torsion and Axial Results in S3D

To review each of these internal member results, simply click the left menu of the result you are looking for. From here a drop down will show the different options for directions. For instance, in the below example we are looking at the Shear Force in the Y direction. Your resulting force diagrams will be overlaid onto each member of your structure. If nothing shows, make sure you have a Load Combination selected in the top left menu. Try these tricks to make results and labels more clear:

  • Click and drag to rotate your structure and view the structure from another angle
  • The force labels are automatically shown can be dragged to improve clarity
  • You can reset the position of the labels by rotating or dragging the structure
  • You can also hover your mouse over the graph to highlight all the evaluation points along the member
  • Adjust visibility settings (e.g. labels on/off) for clearer graphics
  • Review results in 3D renderer
  • Hold S + Scroll Mouse to animate loads up and down

 

Force Explanations

The forces are all internal member forces in the member’s local axis. If you’re unsure about a member’s local axis, it might help to turn on the Local Axis visibility setting.

  • Shear Force
    • Units: kip, kN etc…
    • Translational Force in the member’s local Y and local Z axis
  • Bending Moment
    • Units: kip-ft, kNm, etc…
    • Rotational force about the member’s local Z and local Y axis
  • Axial Force
    • Units: kip, kN etc…
    • Translation force axially to member. Basically, it is the same as shear force, but in local X axis
  • Torsion
    • Units: kip-ft, kNm, etc…
    • Rotational force into member. Basically, it is the same as bending moment force, but about local X axis

 

Isolating Single Result(s)

Clicking an individual member will allow you to view the force diagram for that member whilst hiding all others. To reshow the other shear force diagrams, re-click the Shear button on the left navigation menu. Here’s an example of how you can select a single member to isolate this member’s bending moment diagram (in this case, about Y):

You can also hold CTRL and click+drag to display a group of members:

bending-moment-isolation-skyciv

Additionally, you can use the single member functionality, to isolate a member and see detailed force diagram.

A Special Note on Axial Force

SkyCiv offers two views for Axial force in the form of (1) simplified and (2) normal. Simplified, shown in the first image) will display a color and arrow to guide the users to which members are in compression (c, red) and which are in tension (t, blue)The asterix (*) lets the user know that the axial force is non-uniform and should be reviewed in the normal view. By default, SkyCiv will show the largest axial force in member if it is non-uniform.

axial-force-diagram-simple axial-force-diagram-normal

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