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Why Releasing moment??

 
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amit_sharma
Progressive Member
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Joined: 25 Nov 2010
Posts: 47

PostPosted: Sat May 28, 2011 2:23 am    Post subject: Why Releasing moment?? Reply with quote

Gud mrng Sefians.

I need your help. I want to know that in staad, When secondary beam rests on primary one, then why we release the Mz of that secondary beam. What is the exactly reason for this? If we don't do it, then what will the design results and how it affect the proper design?
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mrbabu77
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Joined: 21 Sep 2009
Posts: 29

PostPosted: Sat May 28, 2011 10:32 am    Post subject: Reply with quote

Dear Amit,

This is a fundamental issue that one need to understand before doing any modeling.
In general in staad the joints you create are rigid joints (by default) i.e joint with 3 translations and 3 rotattion components restrained-similar to a fixed joint.

Now as I understand from your mail that you are trying to model the secondary beam supported on to a primary beam. In an ideal case we are assuming that only vertical shear is transfered from secondary beam to primary beam-i.e in staad termes only Fy reactions is anticipated at the secondary beam support. To simulate this condition you need to realease all force components except Fy.

If the Mz moment is not released, then this will induce torsional moment in the primary beam. If you can draw a sketch of the various force components at the joint it is easy to undestand.

I hope this clarifies the question.


Regards,

Babu M.Raghavan
Chartered Structural Engineer

Director

ENGCEPTS Engineering & Consultancy PVT LTD
Thrissur, Kerala
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amit_sharma
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Joined: 25 Nov 2010
Posts: 47

PostPosted: Sun May 29, 2011 7:48 am    Post subject: thanks Reply with quote

Thank You sir..

mrbabu77 wrote:
Dear Amit,

This is a fundamental issue that one need to understand before doing any modeling.
In general in staad the joints you create are rigid joints (by default) i.e joint with 3 translations and 3 rotattion components restrained-similar to a fixed joint.

Now as I understand from your mail that you are trying to model the secondary beam supported on to a primary beam. In an ideal case we are assuming that only vertical shear is transfered from secondary beam to primary beam-i.e in staad termes only Fy reactions is anticipated at the secondary beam support. To simulate this condition you need to realease all force components except Fy.

If the Mz moment is not released, then this will induce torsional moment in the primary beam. If you can draw a sketch of the various force components at the joint it is easy to undestand.

I hope this clarifies the question.


Regards,

Babu M.Raghavan
Chartered Structural Engineer

Director

ENGCEPTS Engineering & Consultancy PVT LTD
Thrissur, Kerala
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