KINDLY HELP ON THIS. THANKS
Solved! Go to Solution.
Solved by DennisVDijk. Go to Solution.
Solved by DennisVDijk. Go to Solution.
Solved by DennisVDijk. Go to Solution.
Hello,
[1] Truss members only take axial forces;
[2] Your member is under tension, so no buckling check is needed and only the section check is aplied.
See screen below:
hope this will help you 🙂
However, I think there is a check for tension resistance. How can we check for tension members stability in robot? Does it mean Robot lacks this???
Members under tension have no stabily issues. Buckling is a compression fail meganism.
HI Dennisveendam,
I discovered Robot assigned tension members as negative and compression members as positive, whereas the reverse ought to be the case. Are there any means I can change this?
Also kindly check the top chord in my model, I was expecting compression all through in the member, (from my hand calculations, only the top chord results disagreed with my hand calculation result)
Not possible to change.This is a sign convention for bar elements: positive - compression, negative - tension.
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Roman Zhelezniak
Robot Evangelist & Passionate Civil Structural Engineer
Hi @Anonymous
Try to select only the top chord and open it in a new window and then display the axial force diagram. It is not clear what values are for what element on the picture you attached.
Hi @Anonymous
Could you attach both the model and your hand calculations (indicate the part for the top chord)?
Your support on ax 7 must be free in x direction, only support vertical. If both support on ax 1 and 7 are fixed horizontaly, tension force will built in the top cord due to bending.
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