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9 inch wall
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kiranchaitra
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PostPosted: Mon Feb 03, 2014 4:57 pm    Post subject: 9 inch wall Reply with quote

Is this safe? building a 9 inch thick brick wall on rcc slab spanning 10 feet by 16 feet without any supporting beams.
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es_jayakumar
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PostPosted: Tue Feb 04, 2014 1:14 am    Post subject: Reply with quote

Dear SEFIan,

What is the circumstance under which you want to erect a 9" thick brick wall on a slab ? Why not 4.5" wall ? If it is only a partition wall (non-load  bearing), you can go for a 4.5" wall , that can be directly supported over slab, provided the slab is properly designed for the wall load. If you require no door opening in the said wall, you can have an inverted beam (up-standing) to support the wall (even 9" thick), thus avoiding beam projection at the slab soffit below, should its unsightliness matters.


E S Jayakumar
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Dr. N. Subramanian
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PostPosted: Tue Feb 04, 2014 1:31 pm    Post subject: Re: 9 inch wall Reply with quote

Withdrawing my earlier response!
NS


Last edited by Dr. N. Subramanian on Wed Feb 05, 2014 4:04 pm; edited 2 times in total
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syed_A
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PostPosted: Tue Feb 04, 2014 6:03 pm    Post subject: Re: 9 inch wall Reply with quote

hello
Sorry sir , withdrawing my response.......without beam i dont think 9" thick brick wall is advisable
bye


Last edited by syed_A on Wed Feb 05, 2014 5:09 pm; edited 2 times in total
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Dr. N. Subramanian
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PostPosted: Wed Feb 05, 2014 4:03 pm    Post subject: Re: 9 inch wall Reply with quote

Dear Er Kiran,

I am sorry. I did not read your question properly. You can't construct a 9 inch wall over a slab without a beam. it will cause it to crack.


Best wishes.
NS
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balki16
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PostPosted: Thu Feb 06, 2014 7:30 am    Post subject: Reply with quote

Dear Sir

As long as the load on account of wall and the load that may come over it are taken in the design of slab,  the wall can be constructed over the slab.

with regards

K. B.
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umeshrao
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PostPosted: Sat Feb 08, 2014 11:09 am    Post subject: Re: 9 inch wall Reply with quote

kiranchaitra wrote:
Is this safe? building a 9 inch thick brick wall on rcc slab spanning 10 feet by 16 feet without any supporting beams.


I think you can design slab for taking load of 9" brick wall. First check that slab can take one way acting shear generated due to load. considering 9" wall weigh 0.54 t/sqm /m height and 3.0 m height of wall will have load of 0.54*3=1.62 t/m length. As load is transfered through two edges ,each edge will have shear force of 0.81 t/m. hence depending upon thickness of slab and % of steel the shear stress will be tv if this is less than tc then load transfer is o.k. Considering the line load on the slab identify effective width for calculation of B.M. per unit length and then design the slab.
When we design slab for point loads from fire tender then we should be extent the same concept for this situation, except that load is line load.Similar to track instead of wheel load. However as in any other case since slab is supporting wall, as rightly pointed deflection will have to be checked so that additional deflection is not greater than span/350 or 20 mm whichever is lower.
Regards
Umesh Rao
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kiranchaitra
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PostPosted: Mon Feb 10, 2014 6:13 pm    Post subject: Reply with quote

please suggest me.
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kiranchaitra
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PostPosted: Mon Feb 10, 2014 6:14 pm    Post subject: Reply with quote

It is a mobile store of 16x10 feet with columns and beams. here is the plan.
I have constructed 9 inch wall on the rcc slab (middle of rcc slab of store)of this shop for building toilet room.



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umeshrao
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PostPosted: Wed Feb 12, 2014 11:09 am    Post subject: Reply with quote

kiranchaitra wrote:
It is a mobile store of 16x10 feet with columns and beams. here is the plan.
I have constructed 9 inch wall on the rcc slab (middle of rcc slab of store)of this shop for building toilet room.



The above statement indicates that  slab is already cast without consideration of 9" wall in the design, or it is being designed.
In case slab is cast and you intent building wall , do you have to build 9" thick for any specific reason? Is it feasible to use aerated autoclave concrete blocks where density of the material is only 650  kg/ cu.m, hence 200 mm wide [thick] will weigh only 130 kg/ sqm. instead of 2000 kg/cu.m and weighing 400 kg/sqm. If EWC is provided instead of IWC then you could even use plastic coated sheet in aluminum work for privacy as is done for most of partitions between toilets.
In case you are at the designing stage, then consider this as point load on the center of slab and design for moments generated due to udl [ self wt.+ floor finish+ll] and point load due to wall.
Regards
Umesh Rao
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