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manish_del SEFI Member

Joined: 26 Jan 2003 Posts: 10
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Posted: Thu Dec 09, 2004 7:46 am Post subject: pile cap design |
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Dear Sefians,
I have to design foundation for large oil storage tank. As the area is on reclaimed soil, pile foundations are suggested. How is the pile cap designed in such cases where there is uniformly distributed pressure as load? Any references for design of same? Any information will be appreciated.
Thanks,
Manish Shah.
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manish_del SEFI Member

Joined: 26 Jan 2003 Posts: 10
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Posted: Fri Dec 10, 2004 1:47 pm Post subject: pile cap design |
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Dear Mr.Barua, Thanks for your reply. But when there is uniform pressure load due to tank, how to model the strut-tie? Also, normally, shear is checked at distance d/2 from column face. As there is no column here, how is check for shear done?
Regards,
Manish Shah.
-----Original Message----- Message From ibarua@deguild.com [mailto:ibarua@deguild.com] Sent: Friday, December 10, 2004 8:23 AM To: manish_del@hotmail.com Subject: Daily Digest Thu Dec 9 23:00:02 2004
10 December 2004
Re.: Pile Cap design ---------------
Pile caps are generally analysed without taking into account any contribution of the soil below, as such soils, mostly backfilled soil, sometimes on reclaimed ground, may settle considerably, thereby transferring whatever load that the soil might have sustained to the piles. The design is best done with the help of strut-tie-modeling (STM)technique.
Indrajit Barua.
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Rudra Nevatia ...


Joined: 26 Jan 2003 Posts: 211
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Posted: Sat Dec 11, 2004 8:35 am Post subject: pile cap design |
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Dear Manish,
Has the Geotechnical Engineer suggested piles all over or just below the tank wall?
The normal practice is to provide a ring wall below the the annular plate to carry dead/live/wind/seismic loads. This ring wall also acts as a retaining wall for the soil inside thereby increasing load carrying capacity of the confined soil.
Rudra Nevatia
--- manish_del@hotmail.com wrote:
Quote: |
Dear Sefians,
I have to design foundation for large oil storage tank. As the area is on reclaimed soil, pile foundations are suggested. How is the pile cap designed in such cases where there is uniformly distributed pressure as load? Any references for design of same? Any information will be appreciated.
Thanks,
Manish Shah.
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vjkpatil SEFI Member

Joined: 26 Jan 2003 Posts: 16
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Posted: Sat Dec 11, 2004 12:52 pm Post subject: pile cap design |
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Tanks are tricky. The actual load is of the product inside and not the annular walls which is generally of steel. So it is quite unlikely to suggest piles for ring wall only because if the product is very heavy the bottom would sink and would keep doing so and may even go much below the constructed level. It would be really interesting to know the design of the pile cap as one may have to design the bottom to be supported on piles only.
Vijay Patil
-------Original Message-------
Message From general@sefindia.org Date: 12/11/04 14:13:10 To: vjkpatil@vsnl.com Subject: pile cap design
Dear Manish,
Has the Geotechnical Engineer suggested piles all over or just below the tank wall?
The normal practice is to provide a ring wall below the the annular plate to carry dead/live/wind/seismic loads. This ring wall also acts as a retaining wall for the soil inside thereby increasing load carrying capacity of the confined soil.
Rudra Nevatia
--- manish_del@hotmail.com wrote:
Quote: |
Dear Sefians,
I have to design foundation for large oil storage tank. As the area is on reclaimed soil, pile foundations are suggested. How is the pile cap designed in such cases where there is uniformly distributed pressure as load? Any references for design of same? Any information will be appreciated.
Thanks,
Manish Shah.
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com
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Rudra Nevatia ...


Joined: 26 Jan 2003 Posts: 211
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Posted: Sat Dec 11, 2004 1:45 pm Post subject: pile cap design |
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Dear Vijay,
Please take a look at
http://tinyurl.com/6nule
http://www.astanks.com/EN/Foundation_EN.html
http://www.geocon.net/pdf/paper42.pdf
Regards, Rudra Nevatia
--- vjkpatil@vsnl.com wrote:
Quote: |
Tanks are tricky. The actual load is of the product inside and not the annular walls which is generally of steel. So it is quite unlikely to suggest piles for ring wall only because if the product is very heavy the bottom would sink and would keep doing so and may even go much below the constructed level. It would be really interesting to know the design of the pile cap as one may have to design the bottom to be supported on piles only.
Vijay Patil
-------Original Message-------
Message From general@sefindia.org Date: 12/11/04 14:13:10 To: vjkpatil@vsnl.com Subject: pile cap design
Dear Manish,
Has the Geotechnical Engineer suggested piles all over or just below the tank wall?
The normal practice is to provide a ring wall below the the annular plate to carry dead/live/wind/seismic loads. This ring wall also acts as a retaining wall for the soil inside thereby increasing load carrying capacity of the confined soil.
Rudra Nevatia
--- manish_del@hotmail.com wrote:
Dear Sefians,
I have to design foundation for large oil storage tank. As the area is on reclaimed soil, pile foundations are suggested. How is the pile cap designed in such cases where there is uniformly distributed pressure as load? Any references for design of same? Any information will be appreciated.
Thanks,
Manish Shah.
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