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Reinforcement details in walls

 
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sasindran_s
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Joined: 28 Jul 2017
Posts: 12
Location: Chennai

PostPosted: Mon Jan 08, 2018 6:07 am    Post subject: Reinforcement details in walls Reply with quote

Hi fellow SEFIans,

I have a basic question. During a recent discussion with one of my senior we found a discrepancy.
With respect to the reinforcement details in case of a Rectangular tank, the vertical reinforcement shall be placed towards the inside face i.e away from the liquid face/outside face and the horizontal reinforcement (hoop tension reinforcement) shall be placed towards the liquid face/outside face. My point for this kind of placing was the ease in tying the horizontal reinforcement if it is placed outside.
My senior pointed out that this case is the reverse in case of Circular tanks i.e vertical reinforcement will be placed on the liquid face/outside face and horizontal reinforcement will be placed towards the inside face (away from the liquid face/outside face). This is agreeable as there will be vertical bending that will be the governing the case and hence the vertical reinforcement is needed on the outside face.
Now my query is, if the vertical bending is high in case of a rectangular tank will the vertical reinforcement be placed on the liquid face/outside face or will it be placed as per the conventional method?

Someone please help in this regard.

Regards,
Sasindran S
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1139
Location: Cochin

PostPosted: Tue Jan 09, 2018 3:33 pm    Post subject: Reply with quote

Dear Er.Sasindran,
The reinforcement that is required to cater to the maximum bending moment should preferably be placed in the layer nearer to the surface, in order to avail more lever arm. So, the direction of this outer layer depends on the direction of the maximum moment (in the case of a rectangular tank). In the case of a circular tank, the horizontal hoop steel is required to resist the tension alone and hence the same can always  be provided in the inner layer (it can, in fact, be placed any where), thereby providing more lever arm to the vertical flexural steel. The structural requirement will outweigh the easiness in placing the bars.

Regards,
E S Jayakumar
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sasindran_s
SEFI Member
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Joined: 28 Jul 2017
Posts: 12
Location: Chennai

PostPosted: Wed Jan 10, 2018 11:14 am    Post subject: Reply with quote

es_jayakumar wrote:
Dear Er.Sasindran,
The reinforcement that is required to cater to the maximum bending moment should preferably be placed in the layer nearer to the surface, in order to avail more lever arm. So, the direction of this outer layer depends on the direction of the maximum moment (in the case of a rectangular tank). In the case of a circular tank, the horizontal hoop steel is required to resist the tension alone and hence the same can always  be provided in the inner layer (it can, in fact, be placed any where), thereby providing more lever arm to the vertical flexural steel. The structural requirement will outweigh the easiness in placing the bars.

Regards,
E S Jayakumar



Dear sir,

Thanks for your reply.

Currently we are facing this issue from two of our Structural Consultants. One of them is providing the horizontal rod nearer to the face and the other one is providing vice versa.

Now as I read your post it became clear what to comment.

Thanks,
Sasindran S
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