ETABS_ 1a

This is in Continuation to the ETABS_ 1 blog regarding the Shear Check of Beam. 

The first post was only about the Shear Check. I rechecked the Beams for Shear and it passed as per my calculation. But the software showed otherwise. That was because of the additional external Torsion which I added to the beam. The Torsion in the Beam was added due to the Hollow Core Slabs which is supported on Beam ledges. 

As per IS code, the torsion is converted to shear. Using clause 41.3, the equivalent Shear is calculated as,



The torsion has been converted to Shear, it is therefore taken wholly by the Stirrups. Only the transverse reinforcement takes the torsion. 

As per ACI 318-19, the torsion reinforcement is provided in both the directions, clause ACI 22.7.6


But here's the catch, the point I am trying to make. There is an upper limit of the combination of Shear and Torsion that can be carried by the section. This is given in clause ACI 22.7.7.1a. This can also mean that the beam of certain dimension may pass the Shear and Torsion check separately but might fail on the combination. 

So, I guess I didn't have much option other than increase the depth of the Beam.



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