Autodesk Robot Structural Analysis

[#1]

Hi

When reviewing results regarding deformation and displacement I have some problem with the model Im working on currently.

See attached pdf. From the graphic deformation view it seems like the displacement for node 7 is 4 mm for case 3000. From the displacement table the displacement for node 7 is 34 mm for case 3000.

Maybe a stupid question, but why does Robot show 4mm graphically and 34 mm in the table?

Is it possible to view all nodal displacements from the table graphically?

Thanks

- Hallvard

[#2]

Hallvard,

My assumption is that you compare different types of results. Could you send me the rtd file saved with the deformation diagram displayed and the opened table so that I could check what you actually set to be displayed please? The descriptions on the diagram shows extreme values (which can be at any locations along bars) rather than nodal values.

[#3]

I tried to attach the model, I dont know if there is a file size limitation, but hopefully it will work.

You are probably right that I am comparing different types of results.

I would like to view:

- Nodal displacement, with description graphically

- Bar displacement, with description graphically

[#4 · Accepted solution]

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Hallvard wrote:

I tried to attach the model, I dont know if there is a file size limitation, but hopefully it will work.

The model has not been updated but ..

You are probably right that I am comparing different types of results.

I would like to view:

- Nodal displacement, with description graphically

Display diagram of Deformation. Mind that the shape of structure deformation between nodes (along bars) may be inaccurate for this type of the display.

- Bar displacement, with description graphically

Display the exact deformation.

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Hope this helps.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[#5]

The model is too large for e-mailing and it didnt work to attach it to my reply.

You are probably right that I compared different types of results. But from general structural estimations, the nodal displacement and maximum--bar-deflection should be approximately the same.

I did define geometrical imperfections for bars in the structure, I have now removed all geometrical imperfections, and now the results seem ok.

So my question will be redefined

I want my analysis to consider initial curvature of the timber elements, especially columns. That is the reason i defined geometrical imperfections. Further reading in Eurocode5 Point 6.3.2 for timber show that the factors ky, kz, kc,y, kc,z and beta_c take initial curvature into account. So I dont think I need to define geometrical imperfections anyway.

Artur: Last week you provided a chart regarding lateral buckling. If you could provide a chart for the factors mentioned above it will be appreciated.

Thanks

- Hallvard

[#6]

Further reading in Eurocode5 Point 6.3.2 for timber show that the factors ky, kz, kc,y, kc,z and beta_c

Last week you provided a chart regarding lateral buckling. If you could provide a chart for the factors  mentioned above it will be appreciated.

I'm sorry but I'm not sure if I understand your request correctly. All these factors are calculated according to the formulas given in EC5 based on the cross sectional properties of a profile you used and its material. You don't select them in the user interface directly.

[#7]

I would like to see the calculations, to be sure that I define everything correctly, so that the factors come out correctly

. But nevermind I can check it myself versus calculations by hand.

Thanks:-)

[#8 · Accepted solution]

Please check http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Autodesk-Robot-Verification-and-Theory/m-p/3...

and look at the last verification example in Verification Manual EU codes.pdf

[#9]

Perfect! Thanks:-)