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Design for Torsion

 
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Paresh
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Joined: 06 Feb 2021
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PostPosted: Fri May 21, 2021 5:01 am    Post subject: Design for Torsion Reply with quote

Dear Members,

I am working on Project in STAAD and got stuck in beam design (Beam No  55) as I am getting error (Tv exceeds Tc(max)).

As I revised the Grade of Concrete and also increase the member cross-section but nothing didn't work out.

I think this error is due to torsional moment(Mx) getting on primary beam (DUE TO APPLIED SLAB LOAD IN THE FORM OF FLOOR LOAD) and want to know, Do we need to release torsional moment in primary beam also ?

Please check for Beam No 55.



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vikram.jeet
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Joined: 26 Jan 2003
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PostPosted: Fri May 21, 2021 7:10 am    Post subject: Reply with quote

Dear Er
A veteran designer not so proficient on cad working,. My suggestion , if looks funny , pl ignore.

You can try  with AREA load command for slab loads

If slabs are modelled , then the mesh points intersecting with beam for end slabs need to be released .

Earlier designers were releasing Mx for all members except where it is equilibrium torsion case. But of late designers are not releasing , to have 3 D complete effect.

Best wishes
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pvgraju
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Joined: 07 Jun 2020
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PostPosted: Fri May 28, 2021 5:48 am    Post subject: Design for Torsion Reply with quote

Dear Sir,

Beam number 55 is a end member. Torsion is to be considered for that beam design.

Regards,

P.V.Gavarraju.
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vikram.jeet
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PostPosted: Fri May 28, 2021 2:12 pm    Post subject: Reply with quote

Yes, it is good to consider torsion in end beam.

But referring to Cl. 41.1 of IS 456 , such compatibility torsion can be ignored by ignoring the torsional stiffness of end beam ,thereby considering slab connection pinned, simple supported.

Unless torsion is equilibrium torsion. Equilibrium torsion provides stability and safety and MUST be considered.

Due to some partial fixity at monolithic slab with beam , torsion is always there in end beam. But as per IS , any torsional cracking as result of non design is adequately controlled by shear reinf.




pvgraju wrote:
Dear Sir,

Beam number 55 is a end member. Torsion is to be considered for that beam design.

Regards,

P.V.Gavarraju.
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