Shear force results at member nodes
Every graphic results for bars can be shown through Results/Diagrams for bars...
Rafael Medeiros
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Could you attach a screen capture showing what you mean? The shear forces Fy and FZ for bars are always in force unit (kN) rather than kN/m which seems like value of load instead.
Artur Kosakowski
Please see attached screenshots.
I'm sure this is straightforward, but I cannot find the menu/button to do this.
For example, I'm expecting the vertical reaction from the end of member 283 will be about 500kN from the worst-case load combination. How do I display/view this?
(I have removed the applied loads from the screenshot which were in kN/m - ignore my comment on this!)
Might have figured this out with "detailed analysis". I'm surprised Fx gives the vertical forces, rather than Fz though.
Internal forces in bar elements are in their local coordinate systems rather than the global one with the local X being along the bar. Shear forces in bars are FZ and FY respectively.
Mind that for a truss you don't have shear forces in chords as they are distributed to posts and diagonals whereas bending is 'replaced' by tension and compression in these very chords therefore you see FX and very small FZ.
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Artur Kosakowski
I'm not sure if I understand what do you need exactly ( I assume it is not FZ value at the end of the bar as you have these values in the Forces table directly). Could you attach a sketch that illustrates your question?
Artur Kosakowski
Yes, it is that simple! 🙂 It is just the shear force at the end of the member I need so I can complete a hand calculation to check the bolted connection.
When I look at the Forces table (taking member 283, at node 272 as an example from above), the max values I am getting for Fz are not what I expect for the shear force. This should be about 300kN. Please see image attached.
When I look at the supporting column (member 280) this has a 317kN axial force (albeit not all of this will be from member 283).
How can I view the end member reactions/shear forces?
Reactions tab on " diagrams for bars..." on Results menu
Rafael Medeiros
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Hi Rafacascudo
Please see below when I try that... 21.7kN is not the end reaction I need - this should be circa 300kN.
Not sure what I'm doing wrong!
How do you calculate FZ force at the chord end (beam vs. truss)?
If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.
Artur Kosakowski
I set the display in such a way that the diagrams are shown only for selected bars and nodes. If I add posts and diagonals you will see that for the truss the load is distributed to supports via axial loads in posts and diagonals rather than shear in chords.
If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.
Artur Kosakowski
