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Secondary beams: Horizontal or vertical

 
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Vishal
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Joined: 06 Aug 2008
Posts: 122

PostPosted: Sun Jan 16, 2011 8:07 pm    Post subject: Secondary beams: Horizontal or vertical Reply with quote

Hello all,

See attached figure.

Here, some of the secondary beams are horizontal and some vertical.

My question is:

What is the criteria behind this? When should the secondary beams be vertical and when horizontal?

Any code  rules/references will be useful.



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gpsarathyy
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Joined: 28 Jun 2010
Posts: 484
Location: chennai

PostPosted: Mon Jan 17, 2011 7:44 am    Post subject: Reply with quote

Dear Sefian,

The secondary beams are mainly provided to support the equipments/pumps or the gratings/chequered plates etc.,
The spacing and the direction are also governed by the same. In general for spanning the grating the spacing between the beams shall not exceed 1.2m c/c. If you exceed this span then you may have to go for next higher level grating.
Similarily for chequered plate also it is having some span constraint based on the thickness of chequered plate used and the loadings.
Its purely Engineers choice to arrange the secondary beams provided above are the constraints or which decides the arrangement.

I hope it clears your doubt.

Regards,
G.Parthasarathy.
Chennai
Email: GPSARATHYY@GMAIL.COM
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nwalavalkar
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Joined: 18 Nov 2010
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PostPosted: Thu Jan 20, 2011 7:28 am    Post subject: Reply with quote

System is symmetrical about axis joining J - 10.

Good arrangement. Less fabrication details.

Regards
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gpsarathyy
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PostPosted: Thu Jan 20, 2011 8:30 am    Post subject: Reply with quote

Er. Vishal,

Have you satisfied with my reply, or still you need clarification on this?

Regards,
G.Parthasarathy
Chennai
Email: GPSARATHYY@GMAIL.COM
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Vishal
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Joined: 06 Aug 2008
Posts: 122

PostPosted: Thu Jan 20, 2011 10:42 am    Post subject: Reply with quote

Dear Er.Parthasarathy,

Thanks a lot for the reply and soorry for being late as I was in a place where internet is not accesible easily.

You said:

In general for spanning the grating the spacing between the beams shall not exceed 1.2m c/c. If you exceed this span then you may have to go for next higher level grating.

I did not follow the term 'next high level gratiing'.

What do you mean by next high level grating?
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vikram.jeet
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Joined: 26 Jan 2003
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PostPosted: Sat Jan 22, 2011 10:30 am    Post subject: Secondary beams: Horizontal or vertical Reply with quote

Dear Er Vishal

Secondary beams
From the appended sketch:
The building has two blocks of similar size configuration and arrangement placed  
orthogonal to each other.That is why secondary beams seem along X axis in one Block  
and along Y axis in other Block.
Secondary beams are required to be introduced if rcc panels are large sized.
Providing large sized solid slab panels will consume heavy steel. Secondary beams reduce
the steel consumption.The concrete quatty may come at par including extra shuttering cost.

Secondary beams are provided resting on main beams.If functional needs donot  
dictate, these are provided along short span of panel to break longer dimension
into smaller panels.

Provision of sec beams in industrial buildings is nicely explained by
Er G.Parathasarthy.

best regards  

vikramjeet
-- ญญ

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gpsarathyy
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PostPosted: Tue Feb 01, 2011 1:58 am    Post subject: Reply with quote

Vishal,

Next higher level means, higher thickness grating.
Generally
25mm thick span for 1.2mc/c
30mm thick can span more than 1.2m etc.,

similarily
6 thick Chequered plate can span for 1m c/c
8 thick means it can span more

But all depends on the loading intensity and the allowable deflection criteria etc.,

Regards,
G.Parthasarathy
Chennai
GPSARATHYY@GMAIL.COM
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Vishal
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Joined: 06 Aug 2008
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PostPosted: Tue Feb 01, 2011 9:07 am    Post subject: Reply with quote

Dear Sir,

I don't get this; you said:

Generally
25mm thick span for 1.2mc/c
30mm thick can span more than 1.2m etc.,

What exactly you meant by 25mm thick span or 30 mm thick span?

Vishal
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