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Load Distribution on a slab.

 
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me_onnetwork
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Joined: 19 Jan 2009
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PostPosted: Wed Apr 21, 2010 11:10 am    Post subject: Load Distribution on a slab. Reply with quote

Dear Sefians.

Greetings of the day!!


I am designing a slab which is 5mX7m in length. It is supported by beams in all three side but the remaining one side is simply supported on a corbel.

I have to calculate the loads that are transferred on beam from the slab.How this distribution of load should be done.Would it be same as in the case of a two way slab in which we consider a trapezoidal or triangular load distribution on the beams?

The slab is 300mm thick and has to be designed for 15kN/m2 live load.

Please suggest.

Thanks & Regards
Bhawna
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B.V.Harsoda
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PostPosted: Wed Apr 21, 2010 2:01 pm    Post subject: Reply with quote

Er. Bhawna,

The distribution of load should be done same as in the case of a two way slab in which you should  consider a trapezoidal or triangular load distribution on the beams.


Best Wishes,

B. V. Harsoda
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me_onnetwork
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PostPosted: Wed Apr 21, 2010 4:36 pm    Post subject: Reply with quote

Thank You SIr.

But this means the support condition doesnt affect the load distribution in a slab. Is it so ?

Thanks & Regards
Bhawna
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B.V.Harsoda
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PostPosted: Thu Apr 22, 2010 2:03 am    Post subject: Reply with quote

You are right, the support condition doesnt affect the load distribution in a slab,support condition only affect benfing moment coefficients as givn in IS 456-2000 ANNEX D Page 90.

Best wishws,

B. V. Harsoda
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Dr. N. Subramanian
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PostPosted: Thu Apr 22, 2010 1:03 pm    Post subject: Reply with quote

Dear Er Bhawna,

Support conditions of slabs will affect the load to be supported by the beam. They are based on yield line theory. The distribution is triangular on beams in the short direction and trapezoidal on beams in longer direction, provided all the edge supports are simply supported or continuous (fixed). But if one side is not supported (free end) then the load distribution will change- See Table 63 of Reynolds handbook for the distribution and coefficients. You may note that even for mixed simply supported and fixed conditions there is a slight variation in the distribution of load, as per yield line theory.

In your case one edge is supported on Corbel and the other sides are continuous, hence you may take the usual triangular and trapezoidal load distribution on short and long beams resply.

Best wishes,
NS
me_onnetwork wrote:
Thank You SIr.

But this means the support condition doesnt affect the load distribution in a slab. Is it so ?

Thanks & Regards
Bhawna
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