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Pile cap edge distance

 
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SRAVANTHI
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PostPosted: Wed Apr 12, 2017 10:30 am    Post subject: Pile cap edge distance Reply with quote

Dear Sefians

Why is the edge distance of pile to pile cap 150mm according IS 2911? What is the criteria for 150mm?
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gpsarathyy
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PostPosted: Thu Apr 13, 2017 8:49 pm    Post subject: Reply with quote

Dear Sefian,
Minimum edge distance to be maintained between the pile cap and the piles.
In order to provide rebars between the pile and the outer pilecap and considering the cover requirements. It is fixed as 0.15m,(as minimum)
But you can have additional edge distance also.
Based on the case to case it shall be finalised.

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G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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N. Prabhakar
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PostPosted: Fri Apr 14, 2017 6:33 am    Post subject: Pile cap edge distance Reply with quote

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Last edited by N. Prabhakar on Fri Apr 14, 2017 1:38 pm; edited 1 time in total
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N. Prabhakar
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PostPosted: Fri Apr 14, 2017 1:21 pm    Post subject: Reply with quote

Dear Sefians,

In small sized pile caps (for and up to 6 piles, not raft type), where the angle  θ  subtended from centre lines of column to pile  (see sketch attached) is geater than 300 , then there is tie-strut action in the transfer of load from the column to the pile.  In this context, the tie is the reinforcement provided at the bottom between piles, and the strut is the inclined compression zone of concrete from column to pile.

The tie reinforcement is to be anchored well beyond the centre line of pile with a development length.  Because the edge projection of concrete beyond pile is normally small, providing the required development length of tie bar beyond centre line of pile is a problem to satisfy the requirement of Cl. 26.2.2.5 of IS 456: 2000 which would involve providing a large radius of bend to reinforcement bar at 900  bend.  This detailing is not practical in all cases.   Alternatively, horizontal links of equivalent  area equal to 1/4 area of the main tie bars, are to be provided very close to the bottom tie reinforcement to take care of the bursting action due to tie force. Please see the the attachments.

I trust you will find the above information useful in detailing pile cap reinforcement.

With best wishes,

N. Prabhakar, BE, CEng(I), MIStructE (UK), MIE (Ind)
Chartered Structural Engineer
Vasai (E), Pin 401 208[/quote]
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N. Prabhakar
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PostPosted: Sat Apr 15, 2017 5:15 am    Post subject: Reply with quote

Dear Sefians,

I am attaching a jpg file which is missing in my previous posting.

With best wishes,

N. Prabhakar
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N. Prabhakar
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PostPosted: Sat Apr 15, 2017 12:48 pm    Post subject: Reply with quote

Dear Sefians,

I am attaching jpg files which are missing in my previous posting.

With best wishes,

N. Prabhakar
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N. Prabhakar
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PostPosted: Sat Apr 15, 2017 2:04 pm    Post subject: Reply with quote

Dear Sefians,

I am attaching docx files which are missing in my previous posting.

With best wishes,

N. Prabhakar
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N. Prabhakar
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PostPosted: Sun Apr 16, 2017 1:29 pm    Post subject: Reply with quote

Dear Admin,

Why my attachments in this posting are not seen?

These attachments are important in the context of my text.  Please do the needful.  

Thanks.

N. Prabhakar
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SRAVANTHI
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PostPosted: Mon Apr 17, 2017 5:34 am    Post subject: Reply with quote

Thank you for your information sir.
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es_jayakumar
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PostPosted: Mon Apr 17, 2017 4:17 pm    Post subject: Reply with quote

I think, there is one more point in keeping the edge distance of 150mm, from construction point of view. It is difficult to keep the pile centres exactly to the required alignment while casting them. So, this edge distance of 150mm will give us allowance to keep the pile cap and thereby column in the exact location, despite the piles being minutely wayward.

E S Jayakumar
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