Hi, I am modelling a simple frame. What I cannot understand are displacements of 5 bars hanging from the main beam from the 4th load case "V1". It gives me over 34 meters of node displacement. Can somebody help me?
Incorrect displacements
@Anonymous
Not easy to answer with screenshots only.
Share your model (zip it before)
M. Agayr
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you probably ignored an instability warning?
Rafael Medeiros
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@Anonymous
Didn't see any problem in your model.
Yes indeed weird displacememnts for nodes 6 13 14 15 16 under case 4.
M. Agayr
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your beam has no torsional inertia. Use a truss or create a compound section.
Stéphane Kapetanovic
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There is no instability reported
So what is weird is that the displacement is 10 times greater than the length of the bar if it was horizontal
M. Agayr
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What type of sections used! I think the section are wrongly defined
I tried to change the section to concrete 450*450 and the displacement seems to be reasonable! (see the pic)
Please check your sections!
.
Mohammed Ata
Structural Design Engineer
Autodesk Expert Elite
You have chosen a compound section and its calculation only adds the torsional inertias of each member instead of creating a complete section having an inertia as tubular
Stéphane Kapetanovic
don't forget to click the Accept Solution button and leave a < like !