Community
708 Views, 5 Replies
Hi!
I'm wondering about 2D Frame analysis differences. It's basically a similar problem as described here: https://forums.autodesk.com/t5/robot-structural-analysis-forum/wrong-diagram-results/td-p/5163217
When I do the frame analysis, my calculations on paper and in Robot differ a bit. I understand it is due to the differences in material stiffness. The calculations on paper indicate, that the local extremum should be 45 not 50,62. Is there any way to discard the material stiffness so I could get the same results as on paper?
Hi!
I'm wondering about 2D Frame analysis differences. It's basically a similar problem as described here: https://forums.autodesk.com/t5/robot-structural-analysis-forum/wrong-diagram-results/td-p/5163217
When I do the frame analysis, my calculations on paper and in Robot differ a bit. I understand it is due to the differences in material stiffness. The calculations on paper indicate, that the local extremum should be 45 not 50,62. Is there any way to discard the material stiffness so I could get the same results as on paper?
Accepted solution
It doesn´t matter the value of E as long as it is the same for the 3 bars. Results for bar forces will be the same being it steel or concrete . Deformations will be obviously different.
You are probably seeing the result at the wrong spot. Your book is probably showing the moment(45) at midspan while Robot is showing the max moment on that span. If you create a node on midspan and ask it to show all values ,then you will get what you want. Below with concrete as material instead of steel for all 3 bars
Rafael Medeiros
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
It doesn´t matter the value of E as long as it is the same for the 3 bars. Results for bar forces will be the same being it steel or concrete . Deformations will be obviously different.
You are probably seeing the result at the wrong spot. Your book is probably showing the moment(45) at midspan while Robot is showing the max moment on that span. If you create a node on midspan and ask it to show all values ,then you will get what you want. Below with concrete as material instead of steel for all 3 bars
Rafael Medeiros
Did you find this post helpful? Feel free to Like this post.
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
I realized that you apply a release to the bar, that is why the moment is not correct, the moment diagram in the right figure is correct.
I realized that you apply a release to the bar, that is why the moment is not correct, the moment diagram in the right figure is correct.
Forums Links
Can't find what you're looking for? Ask the community or share your knowledge.
Post to forums
