property modifier in section properties 1

[aqibusman]

In ETABS , what property modifier i should use for torsion.
if i use .05 then my analysis will be stable or not.
what effects i will get if i put torison modifier 0.05 instead of 1.

thanks

 

[slickdeals]

You need to use J for modifying torsion. 0.05 will mean you have very little torsional resistance. Even a slight eccentric load might cause large displacements. The analysis might be unstable depending on the loading.

 

[lisica]

There is the equilibrium and compatibility torsion.
So I think, if the torsion is not needed for equilibrium there should not be any problems if you put 0 instead of 1.

 

[aqibusman]

what i get beam failure due to torsion is the simple beam slab structure. But torsion failure of exterior beam. It means due to continuity of slab , torsion is developing in beam.
Does it possible i can release the slab ends.

 

[lisica]

It is clear why the torsion is developing. Try to put zero in the properties. Analysis will be completed without problems if it's compatibility torsion.

 

[zeemas]

When ever you design an edge beam, it will get lots of torsion from continuity of slab; but in reality the torsion in beam is released when the first crack appears at the beam and slab connection. I will agree with Lisica that put zero in torsion modifier and the ETABS will complete the analysis without any warning if it is compatiblility torsion.

 

[structuresguy]

Could you not just release the torsion moment at the end connections of the beam? I would think this would have a similar effect.

 

[zeemas]

I will suggest to modify torsion stiffness modifier instead of releasing the moment, fast and less chance for getting unstability warnings.