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Beam Torsion in ETABS
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Abishek_Siingh
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PostPosted: Wed Mar 06, 2013 7:06 am    Post subject: Beam Torsion in ETABS Reply with quote

Dear All,

Can anyone please let me know how to release torsion in beams modelled in etabs?
The beams that generally passed in STAAD even without torsion release are failing in etabs in combined shear and torsion.

Generally do you guys also face problems in beam design in ETABS? I think it unnecessarily calls for extra beam width.

Thanks
Abhishek
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sakumar79
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PostPosted: Wed Mar 06, 2013 4:13 pm    Post subject: Reply with quote

Dear Sir,
   To release torsion in ETABS, select the beams/columns, go to Assign->Frame/Line-> End Releases and assign torsion in start node OR end node. Note that unlike STAAD, you cannot assign torsion release to both ends. Also, there is no partial release as in STAAD though you can assign spring stiffness instead of full release.


   Personally, I dont think ETABS results are much different from STAAD as far as beam design is considered as long as forces considered (shear, moment and torsion) are same. Have you given care to enter the cover, etc for beam design sections?

Yours sincerely
Arunkumar
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Manoharbs_eq
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PostPosted: Thu Mar 07, 2013 9:18 am    Post subject: Reply with quote

Dear Arun,

We can assign a value of 0.3 to 0.5 in frame property modifiers (J3) if we have to reduce the effect of torsion in beams.

Rgds
Manohar
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sakumar79
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PostPosted: Thu Mar 07, 2013 11:29 am    Post subject: Reply with quote

Dear Er. Manohar,
   Thank you for pointing out that setting a value of 0.3 to 0.5 in frame property modifiers (J3) will act as partial torsion release. Possibly, setting value of 0.01 is equivalent to 0.99 Partial release (MPX 0.99). Further, it may be noted that this setting is made for a section and not for a member (unlike STAAD).

   Could you share your experience in beam design of ETABS vs. STAAD?

Yours sincerely
Arunkumar
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Manoharbs_eq
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PostPosted: Thu Mar 07, 2013 11:40 am    Post subject: Reply with quote

Dear Kumar,

Like you have rightly said Beam design does not differ from Stadd and Etabs for same codes any way. But forces observed by the elements differ,the behavior and basic assumption if same in both then the design forces will be same.

torsion release for a element need not be in both the ends in etabs as torsion to beam element is released at supports.




Rgds
Manohar
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vijaypatil
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PostPosted: Fri Mar 08, 2013 5:22 am    Post subject: Beam Torsion in ETABS Reply with quote

Dear Abhishek,

There is an option frame property modifier in assign.
Select the beam and assign the torsional constant (say 0.000001).  

Regards,

VIjay

From: Kumar_Abhishek_Singh [mailto:forum@sefindia.org]
Sent: Wednesday, March 06, 2013 12:36 PM
To: general@sefindia.org
Subject: [SEFI] Beam Torsion in ETABS



Dear All,

Can anyone please let me know how to release torsion in beams modelled in etabs?
The beams that generally passed in STAAD even without torsion release are failing in etabs in combined shear and torsion.

Generally do you guys also face problems in beam design in ETABS? I think it unnecessarily calls for extra beam width.

Thanks
Abhishek






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sandeepsinghoshan
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PostPosted: Fri Mar 08, 2013 5:29 am    Post subject: Beam Torsion in ETABS Reply with quote

Adopt the following procedure
1:- select all beams
2 :- select property modifier . In property modofier put TORSION value ZERO (0)

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findravi1
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PostPosted: Fri Mar 08, 2013 6:05 am    Post subject: Beam Torsion in ETABS Reply with quote

Select beam. Go in properties modifier . Put value 0,  u will get effect  On Mar 8, 2013 10:37 AM, "Kumar_Abhishek_Singh" <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear All,

Can anyone please let me know how to release torsion in beams modelled in etabs?
The beams that generally passed in STAAD even without torsion release are failing in etabs in combined shear and torsion.

Generally do you guys also face problems in beam design in ETABS? I think it unnecessarily calls for extra beam width.

Thanks
Abhishek
     



     


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SANGEETA WIJ
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PostPosted: Fri Mar 08, 2013 9:13 am    Post subject: Beam Torsion in ETABS Reply with quote

Dear Abhishek
When in doubt, always do a manual check, for couple of important beams, and please do not forget that releasing torsion must also be followed with correct detailing of secondary beam r/f at junction with main beam.If this is not diligently followed, the release will stay only in the model, and will not happen in the actual structure.
Regards
Sangeeta Wij

From: Kumar_Abhishek_Singh [mailto:forum@sefindia.org]
Sent: 06 March 2013 12:36
To: general@sefindia.org
Subject: [SEFI] Beam Torsion in ETABS



Dear All,

Can anyone please let me know how to release torsion in beams modelled in etabs?
The beams that generally passed in STAAD even without torsion release are failing in etabs in combined shear and torsion.

Generally do you guys also face problems in beam design in ETABS? I think it unnecessarily calls for extra beam width.

Thanks
Abhishek

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Manoharbs_eq
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PostPosted: Fri Mar 08, 2013 9:43 am    Post subject: Reply with quote

Dear Vijay and Sandeep,

It is not advisable to release torsion in all beams and not to zero or such a least value. Beam will have to be designed for some torsion that arises due to alternate loading or pattern loading.


Rgds
Manohar
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