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how to release secondary beam on three of four cantilever
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Thu Aug 14, 2014 9:30 pm    Post subject: Reply with quote

Dear Er Atif,
The cantilever is simple and the BM can be calculated at the end as wL^2/2 and this can be given as the moment at the fixed end. The beam is resting only on the interior beam!

Best wishes,
NS
mohd atif wrote:
thanks  everyone for replying,
please check staad file , skecth



file name staad corresponds to the sketch


and file name staad 2 beam 339 contains long cant beam with similar problem
the long cant beam is  about 15 feet length
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mohd atif
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Joined: 27 Jul 2014
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PostPosted: Fri Aug 15, 2014 1:24 pm    Post subject: Reply with quote

respected sir ,
                 but the reactions through the continuous unsupported beam will act on the long beam or
the long beam will act as a propped cantilever with the stiff cantilever supporting the unsupported beam
please rectify my doubt
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5307
Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Aug 15, 2014 2:03 pm    Post subject: Reply with quote

Dear Er atif,

My God!  Only now I looked into the sketch sent by you properly. You have a very long beam which is supported only on cantilever beams, on which many other heavy beams also are supported. I will not approve such a beam. Please provide columns, especially where a long beam is supported by it. Otherwise, the behavior of the system will not be proper.

Best wishes,
NS
mohd atif wrote:
respected sir ,
                 but the reactions through the continuous unsupported beam will act on the long beam or
the long beam will act as a propped cantilever with the stiff cantilever supporting the unsupported beam
please rectify my doubt
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mohd atif
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Joined: 27 Jul 2014
Posts: 14

PostPosted: Sat Aug 16, 2014 2:22 pm    Post subject: Reply with quote

respected sir,
  thank you for  reply  .  there are some restriction (parking and dining) because of that i cannot place a column to support the other  end of long beam.
how should is consider the long beam
1. cantilever,  where the continuous unsupported beam reaction will be transferred to  each cantilever beam and the long beam will be having high moments at the end

  or

2.  propped cantilever , where the stiff cantilever beams are supporting continuous unsupported beam and the long beam resting on  this continuous unsupported beam


sir which one is proper way to analyse
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5307
Location: Gaithersburg, MD, U.S.A.

PostPosted: Sat Aug 16, 2014 5:20 pm    Post subject: Reply with quote

Dear Er Atif,

The column locations as shown in your drawing will not constitute a proper system.

You should move the columns to support the beams, so that the system will have clear load path.

Best wishes,
NS
mohd atif wrote:
respected sir,
  thank you for  reply  .  there are some restriction (parking and dining) because of that i cannot place a column to support the other  end of long beam.
how should is consider the long beam
1. cantilever,  where the continuous unsupported beam reaction will be transferred to  each cantilever beam and the long beam will be having high moments at the end

  or

2.  propped cantilever , where the stiff cantilever beams are supporting continuous unsupported beam and the long beam resting on  this continuous unsupported beam


sir which one is proper way to analyse
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mohd atif
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Joined: 27 Jul 2014
Posts: 14

PostPosted: Sat Aug 16, 2014 7:49 pm    Post subject: Reply with quote

respected sir ,
         i am not able to move the column because of stipulation  set by architect and owner ( due to parking and hall)  .
  sir , can't we analyse the structure without moving  column position
   i could change the beam position
and thank you for reply
  

sir cant we release moment from each  secondary beam  as shown below in the image
is it the right way or stiff cantilever supports  unsupported beam and less stiffer cantilever rest on it
please rectify me
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