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number of secondary beam

 
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diamond_n
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Joined: 12 May 2020
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PostPosted: Tue May 12, 2020 9:36 am    Post subject: number of secondary beam Reply with quote

Secondary beam are  provided  in order to divided the slab into small module so as to   check the deflection and  limit the design depth of slab . So is there any criteria for number of  secondary beams in a slab that should be connected to primary beam ( or number of secondary beam that divide a slab)
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es_jayakumar
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PostPosted: Thu May 14, 2020 1:49 am    Post subject: Reply with quote

You can provide secondary beams in such a fashion that they divide the big size slab into smaller size panels of span (width) 3m to 4m.

E S Jayakumar
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diamond_n
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PostPosted: Thu May 14, 2020 7:19 am    Post subject: Reply with quote

Thank you sir,  for  your  valuable reply  but  I want a further clarification regarding division of slab in following 2 cases  :

1. Diving the slab(6.7m) into two smaller  parts(3.35 m each ) by a secondary beam, which than passes through the mid point ( high bending moment )  of the primary beam  

2.Dividing the slab(6.7m) into three smaller parts by two secondary beam

Both the conditions  are practically feasible , but in the 1st case secondary beam passes through the primary beam in midpoint ( high bending moment) whereas in 2nd case it doesn't passes through mid point .
So taking into  account of structural stability, would  it be preferable to consider the 2nd case (wrt to 1 st case) to implementing in practical situation.
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es_jayakumar
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PostPosted: Thu May 14, 2020 7:44 am    Post subject: Reply with quote

I would advocate provision of a single secondary beam, in consideration of the increased cost of concrete, steel & form-work of an extra beam, even though the main beam will experience a slightly  increased BM.

E S Jayakumar
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diamond_n
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PostPosted: Thu May 14, 2020 8:09 am    Post subject: Reply with quote

thank you sir for your valuable  advice.
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