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Corner footing
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yatendrapaliwal
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Joined: 25 Jan 2010
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Location: NCR - Delhi

PostPosted: Fri Aug 15, 2014 3:59 pm    Post subject: Corner footing Reply with quote

Dear Sefians

please guide   for following case.

in case of corner footings , for design of footing beam, what will be the UDL to be considered.

a) Shall it be the total footing load divided by ( L+B)
b) of shall it be the total footing load divided by ( lesser of L & B)


please guide

Er. Yatendra Paliwal M.I.E.
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binaya shahi
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Joined: 03 Jun 2015
Posts: 19

PostPosted: Wed Mar 30, 2016 3:00 pm    Post subject: what do you mean by udl Reply with quote

to calculate the area of footing simply divide the column reaction by sbc.

to calculate one way punching shear calculate it for both derection sepatately.
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binaya shahi
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Joined: 03 Jun 2015
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PostPosted: Wed Mar 30, 2016 3:12 pm    Post subject: what do you mean by udl Reply with quote

to calculate the area of footing simply divide the column reaction by sbc.

to calculate one way punching shear calculate it for both derection sepatately.
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rajancivildesign@gmail.co
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Joined: 26 Jan 2011
Posts: 566

PostPosted: Wed Mar 30, 2016 3:32 pm    Post subject: Design of Edge or corner column footing design Reply with quote

Dear SAFIAN,
A similar design of corner column footing without considering moment is attached for reference. It is my design only not from any text book. However you can refer Limit state design by U.H.Variyani  for edge footing for reference.
V.M.RAJAN



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DESIGN OF FOOTING FOR CORNER COLUMN.rar
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sknsrinivasan
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Joined: 15 Apr 2013
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PostPosted: Thu Mar 31, 2016 4:46 am    Post subject: Reply with quote

Dear Rajan sir

  I have one doubt, How did you get 0.885 to find out bending moment Please clarify

Regards
N.Srinivasan
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rajancivildesign@gmail.co
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PostPosted: Thu Mar 31, 2016 3:48 pm    Post subject: Corner column footing Reply with quote

Dear Srinivasan,
The footing projection length is arrived as below:
The diagonal length of footing= Sqrt  2x(1.5x1.5)=2.12m
Projection of footing slab= 2.12-0.35/2=0.885m.
Thank you for your quarry.
V.M.RAJAN
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sknsrinivasan
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PostPosted: Fri Apr 01, 2016 11:37 am    Post subject: Reply with quote

Dear Rajan sir

Thank you very much for your Reply

Why you have not checked one way shear of footing any way it is safe against one way shear.But procedure missed. Two way shear need not check since strap beam is there.You have already mentioned this is your design only. I request you to provide explanation how Transfer this footing load to adjutant footing, If you have interest

Regards
N.Srinivasan
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sknsrinivasan
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PostPosted: Sat Apr 02, 2016 11:26 am    Post subject: Reply with quote

Dear Rajan Sir

  I have another doubt forgot to ask. you have designed the Beam as cantilever But Provided Reinforcement at Bottom of beam How it is Possible? any Reason Behind it I want to know please Explain

Regards
N.Srinivasan
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1408
Location: Cochin

PostPosted: Sat Apr 02, 2016 11:46 am    Post subject: Reply with quote

Er.Srinivasan,

It is a cantilever with load acting from bottom to top direction. Hence, naturally, the tension will be at the bottom and so is the tension reinforcement.

Dear Rajan Sir,

I am afraid, due to the huge eccentric placing of the column on the footing ( column being in the corner), the bottom soil pressure distribution will not be uniform, as expected, notwithstanding the stiffener beam. It is possible that the diagonally opposite corner develop tension on soil.

Regards,
E S Jayakumar
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es_jayakumar
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PostPosted: Thu Apr 07, 2016 2:45 pm    Post subject: Reply with quote

Dear SEFIans,
A footing with corner column provided with stiffener beam, as indicated by Rajan Sir is analysed using plate mat support in STAAD. The base pressure diagram (enclosed) indicates tension towards the away corner, beyond the transverse diagonal.

E S Jayakumar



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