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staad pro fixed but support
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HIMMATLAL
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Joined: 20 Jun 2010
Posts: 4

PostPosted: Fri Aug 06, 2010 5:35 pm    Post subject: staad pro fixed but support Reply with quote

can anyone explain me the use of the fixed but support in staadpro. what happens when i tick the required forces & moments.
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sakumar79
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Joined: 18 Apr 2008
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PostPosted: Sat Aug 07, 2010 1:24 am    Post subject: Reply with quote

The Fixed But support condition is used to allow the user to define which degrees of freedom of a node are free and which are fixed.

For example, Pinned support is equivalent to Fixed But MX MY MZ (no movement allowed, rotation allowed)

A roller support can be defined as Fixed But FX FZ MX MY MZ (only vertical movement is restrained. horizontal movement and rotation are allowed)

Similarly, in case you want to add a horizontal restraint which does not give vertical restraint, you can define FIXED BUT FY MX MY MZ

Arun
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sknsrinivasan
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Joined: 15 Apr 2013
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PostPosted: Thu Oct 29, 2020 9:45 am    Post subject: Reply with quote

Dear Arun
   In support  specification  in staad I want to give roller support In fixed but whether  I have to select Fx,Fz,Mx,My and Mz or I have to select only Fy
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N.srinivasan
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es_jayakumar
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Joined: 24 Nov 2011
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PostPosted: Fri Oct 30, 2020 3:51 pm    Post subject: Reply with quote

Suppose your roller support is operating in XY plane.
You want to permit it to :

(1) move in X direction,
(2) rotate in XY plain as a pin joint &
(3) have no freedom for either rotation or translation in other planes / directions.
In that case, release (mark tick in the box of) Fx & Mz only.



E S Jayakumar
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sknsrinivasan
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PostPosted: Sat Oct 31, 2020 2:42 am    Post subject: Reply with quote

Dear Jayakumar
Thank you very much for your reply  
I am having  another doubt for column we have to release Fy,Mx,My and Mz to assign  roller support

N.srinivasan
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sknsrinivasan
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PostPosted: Sat Oct 31, 2020 3:35 am    Post subject: Reply with quote

Sorry consider Fx instead of Fy and Mz instead  of Mx,My and Mz
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es_jayakumar
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PostPosted: Sat Oct 31, 2020 10:13 am    Post subject: Reply with quote

Please indicate whatever  freedom & restraints do you want to assign to the roller support ( I mean translation & rotation permitted  and their directions).

E S Jayakumar
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sknsrinivasan
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PostPosted: Sat Oct 31, 2020 10:39 am    Post subject: Reply with quote

I want to assign vertical roller  and horizontal roller support for vertical member( I don't  have have any idea  which one is correct) If we assign  horizontally  Or Vertically In Column ,Will the result change? You explain
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es_jayakumar
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PostPosted: Sat Oct 31, 2020 10:51 am    Post subject: Reply with quote

If possible, post the detailed drawing of your structure.
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sknsrinivasan
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PostPosted: Sat Oct 31, 2020 11:32 am    Post subject: Reply with quote

Sorry  I don't  have any drawing  substitute  portal frame I want to assign  roller support  in column top and bottom I asked this for understanding purpose only
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