ETABS RC col unssuported length

[niravshah1964]

ETABS RC COL UNSUPPORTED LENGTH:

How do we define in ETABS that clear col ht to be considered for design is equal to floor ht minus depth??

On RC design it considers col ht = floor ht, hence slenderness values go up.

Any idea??

 

[structSU10]

It should just be modified by an appropriate K value. The restraint provided by the beams and slab has a certain stiffness that affect the K factor, and using the floor to floor is slightly more conservative, and i think more appropriate to use when applying a K factor.

 

[niravshah1964]

Thanks

K value as calculated by ETABS is a very big issue. It does no account for skew beams, I think it does not account for slab stifness. I usually overwrite K value for all standard floor to floor col as 1.0.

Just wondering to apply member offset on one side equal to beam depth. This would automatically reduce unsupported col length, but do not know does it have any other effect.

Any idea

 

[niravshah1964]

I tried with overwrite for K value, its working fine.