Beam forces in ETABS vs. SAFE 1

[lebron1987]

I've calculate a structure in Etabs, only for gravitational loads and then I export the first storey in SAFE to calculate both the beam and slab forces.
My question is WHY for the same beam and the same combination the shear force at the end of the beam is 150kN (ETABS) and 100kN (SAFE).
What i'm doing wrong?

Note: Manually calculations is all most equal with the results from ETABS.

Thanks in advance!

 

[radirob]

Share your model, please.

 

[lebron1987]

Please refer to GF combination.

Thanks!

 

[lebron1987]

Here is the Etabs model and the previous post conteins the SAFE model.

 

[tanvir00]

I have faces same problem. Etbas and safe vary a lot in beam design.

 

[slickdeals]

Is your slab modeled as a shell element in ETABS? If so, a section cut would produce the correct result.

If slab is modeled as membrane (no out-of-plane stiffness), I think the results will match.

It’s no trick to get the answers when you have all the data. The trick is to get the answers when you only have half the data and half that is wrong and you don’t know which half - LORD KELVIN

 

[Nonlinearer]

Lebron 1987,

After you export your floor from ETABS to SAFE, assign all bending modifiers as 0.0001 in SAFE in "Assign" menu and uncheck the "thick plate" option in slab properties. Now run your SAFE model and compare your beam shear in ETABS and SAFE, these will match.

Regards,




IR

 

[lebron1987]

@slickdeals: the slab was modelled as membrane element in Etabs.

@nonlinearer: I will try what you say

Thanks for your answers!