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FLAT SLAB - COLUMN DROP

 
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paramesh
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PostPosted: Tue Oct 29, 2019 3:49 am    Post subject: FLAT SLAB - COLUMN DROP Reply with quote

Dear Sirs,

In flat slabs, can we provide the drop thickness near the columns projected upwards with bottom surface flushed with the slab as shown in the attached section-AA, to have more clearance below the slab. There is filling above the slab.

Are there any design/detailing issues if we provide like this. Please share your views on this.

Regards,

PARAMESH.



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sktrisal
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PostPosted: Tue Oct 29, 2019 11:30 am    Post subject: FLAT SLAB - COLUMN DROP Reply with quote

It is ok if it is the last floor it can be provided with waterproof  plaster for the upstands. Sktrisal


On Tue, 29 Oct 2019, 15:56 paramesh, <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Dear Sirs,

In flat slabs, can we provide the drop thickness near the columns projected upwards with bottom surface flushed with the slab as shown in the attached section-AA, to have more clearance below the slab. There is filling above the slab.

Are there any design/detailing issues if we provide like this. Please share your views on this.

Regards,

PARAMESH.
     



     
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es_jayakumar
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Joined: 24 Nov 2011
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PostPosted: Tue Oct 29, 2019 2:56 pm    Post subject: Reply with quote

Your proposal of providing Drops above the flat slab shall hold good to take care of Shear. But, you may have to provide bigger size (width) for the drops, in order to accommodate the steel at top for the negative moment. Anyway, you have to fill the remaining sunk area. You can consider filling this area with the same concrete to maintain level surface, if the additional cost involved is marginal. In other words, your flat slab becomes one without Drops.

E S Jayakumar
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paramesh
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PostPosted: Wed Oct 30, 2019 5:34 am    Post subject: Reply with quote

Dear Sir,

Thanks for your reply.

Regards,

PARAMESH.
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sivaraj
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PostPosted: Wed Oct 30, 2019 8:21 am    Post subject: Reply with quote

Dear Sir,

This is the normal practice in Underground Metro Station, Underground Metro Station Roof Structures are provided with inverted Drop Condition,. Check for the Two-way shear and Shuttering arrangement in site.

Regards
Sivaraj J
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paramesh
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PostPosted: Fri Nov 01, 2019 7:24 am    Post subject: Reply with quote

Hi,

Thank you for sharing the information.

Regards,


sivaraj wrote:
Dear Sir,

This is the normal practice in Underground Metro Station, Underground Metro Station Roof Structures are provided with inverted Drop Condition,. Check for the Two-way shear and Shuttering arrangement in site.

Regards
Sivaraj J
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2feeq008
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Joined: 06 Jun 2016
Posts: 7

PostPosted: Sat Nov 02, 2019 12:30 pm    Post subject: FLAT SLAB - COLUMN DROP Reply with quote

Design your beam along the area as capping beam. Regards

On Tue, Oct 29, 2019, 11:26 AM paramesh <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Dear Sirs,

In flat slabs, can we provide the drop thickness near the columns projected upwards with bottom surface flushed with the slab as shown in the attached section-AA, to have more clearance below the slab. There is filling above the slab.

Are there any design/detailing issues if we provide like this. Please share your views on this.

Regards,

PARAMESH.
     



     
Download Attachments:
FILE 1.pdf




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