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Corner Column Footings

 
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Ashik L Keremane
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PostPosted: Tue Aug 04, 2020 3:49 pm    Post subject: Corner Column Footings Reply with quote

Hello everyone.

Can anyone please guide me on designing the footings for corner columns, I have attached an image showing the column locations. The red line indicates Property line. All the columns are eccentric except the four columns around lift room. The rear columns carry a load of 870 kN , middle eccentric columns carry a load of 700kN and front columns carry a load of 582 kN.

Is it possible to design the exclusive eccentric footings for individual columns or is there any other method. Please share some information



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satishkemkar
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PostPosted: Wed Aug 05, 2020 5:45 am    Post subject: Reply with quote

it is possible to design eccentric footing but care should be taken about contact area of footing with base and redistribution of pressure.
Altenativly you can design strip footing connecting oppsite columns. this will give more stable foundation.
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Ashik L Keremane
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PostPosted: Wed Aug 05, 2020 5:59 am    Post subject: Reply with quote

satishkemkar wrote:
it is possible to design eccentric footing but care should be taken about contact area of footing with base and redistribution of pressure.
Altenativly you can design strip footing connecting oppsite columns. this will give more stable foundation.


Can you recommend any books or literature regarding corner eccentric footing and strip footing? or if you have any design done previously , can you please share?
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AAKASH_GUPTA
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PostPosted: Wed Aug 05, 2020 11:03 am    Post subject: Reply with quote

Dear SEFI members,

I have same issue as posted by Mr. Ashik. I have proposed isolated footing for the corner columns and as it being eccentric i am not sure about stability of footing. can anyone guide me what can i do ensure the stability and proper transfer of pressure.

Thanks & Regards
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naga
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PostPosted: Thu Aug 06, 2020 5:20 am    Post subject: Re: Corner Column Footings Reply with quote

mr.ashik,
it's better to have some more columns.one in between 20' span horizontal  both the ends.
one more between 19'span vertically.
these columns doesn't effect in your plan.and load on each column also reduced to half.
design isolate footings with strap beam connecting all columns at foundation level.
number of floors--?
naga

Ashik L Keremane wrote:
Hello everyone.
Can anyone please guide me on designing the footings for corner columns, I have attached an image showing the column locations. The red line indicates Property line. All the columns are eccentric except the four columns around lift room. The rear columns carry a load of 870 kN , middle eccentric columns carry a load of 700kN and front columns carry a load of 582 kN.

Is it possible to design the exclusive eccentric footings for individual columns or is there any other method. Please share some information
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N. Prabhakar
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PostPosted: Thu Aug 06, 2020 5:27 am    Post subject: Reply with quote

Dear Sefians,

For design of corner column footing with eccentric load, the best solution for stability consideration is to tie the corner footing to an adjacent column footing with a beam. The example of this type of footing is given in many standard books on RC design like, Dr. Subramaniian's book and Reynolds Handbook.

I trust you will ind the above information useful.

With best wishes,

N. Prabhakar
Chartered Structural Engineer
Vasai (E), Pin 401 20
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Ashik L Keremane
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PostPosted: Thu Aug 06, 2020 5:35 am    Post subject: Re: Corner Column Footings Reply with quote

naga wrote:
mr.ashik,
it's better to have some more columns.one in between 20' span horizontal  both the ends.
one more between 19'span vertically.
these columns doesn't effect in your plan.and load on each column also reduced to half.
design isolate footings with strap beam connecting all columns at foundation level.
number of floors--?
naga

Ashik L Keremane wrote:
Hello everyone.
Can anyone please guide me on designing the footings for corner columns, I have attached an image showing the column locations. The red line indicates Property line. All the columns are eccentric except the four columns around lift room. The rear columns carry a load of 870 kN , middle eccentric columns carry a load of 700kN and front columns carry a load of 582 kN.

Is it possible to design the exclusive eccentric footings for individual columns or is there any other method. Please share some information


Thanks for your suggestion, I can provide a column between 19' span, but providing column between 20' will not be possible at the rear end ,because there is a open well, 3 ft beside the property line at the rear center.

And the building is Ground + 3 Storeys commercial building
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Ashik L Keremane
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Joined: 07 Apr 2020
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PostPosted: Thu Aug 06, 2020 5:37 am    Post subject: Reply with quote

N. Prabhakar wrote:
Dear Sefians,

For design of corner column footing with eccentric load, the best solution for stability consideration is to tie the corner footing to an adjacent column footing with a beam. The example of this type of footing is given in many standard books on RC design like, Dr. Subramaniian's book and Reynolds Handbook.

I trust you will ind the above information useful.

With best wishes,

N. Prabhakar
Chartered Structural Engineer
Vasai (E), Pin 401 20


Thanks for your valuable advice Sir, I will definitely check the suggested books.
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es_jayakumar
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PostPosted: Sun Aug 09, 2020 4:01 pm    Post subject: Reply with quote

N. Prabhakar wrote:
Dear Sefians,

For design of corner column footing with eccentric load, the best solution for stability consideration is to tie the corner footing to an adjacent column footing with a beam. The example of this type of footing is given in many standard books on RC design like, Dr. Subramaniian's book and Reynolds Handbook.

I trust you will ind the above information useful.

With best wishes,

N. Prabhakar
Chartered Structural Engineer
Vasai (E), Pin 401 20


For edge columns,  strap / cantilever footings, as suggested by Prabhakar sir, or combined footings, are fine. But, for corner columns, which can develop tension on soil on the two adjacent inner edges of its isolated footing, raft foundation is appropriate. I don't know the efficacy of providing strap footings in the two orthogonal directions from a corner column.

E S Jayakumar
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B.V.Harsoda
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PostPosted: Mon Aug 31, 2020 1:13 pm    Post subject: Reply with quote

Last Post by N. Prabhaker Sir for us.



N. Prabhakar wrote:
Dear Sefians,

For design of corner column footing with eccentric load, the best solution for stability consideration is to tie the corner footing to an adjacent column footing with a beam. The example of this type of footing is given in many standard books on RC design like, Dr. Subramaniian's book and Reynolds Handbook.

I trust you will ind the above information useful.

With best wishes,

N. Prabhakar
Chartered Structural Engineer
Vasai (E), Pin 401 20
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