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Point of fFixity in pile foundation design
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es_jayakumar
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PostPosted: Wed Sep 07, 2016 11:25 am    Post subject: Reply with quote

In that case there will be no point of fixity. The pile will only rotate about a fulcrum or translate as a whole, instead of bending about the point of fixity. In that case, you have to go by other methods, such as Broms method and the like.

E S Jayakumar
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es_jayakumar
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PostPosted: Fri Sep 09, 2016 1:08 am    Post subject: Reply with quote

Er. Saikiran,
An analytical solution to your problem is attempted using STAAD. It indicates excessive rotation for the pile analysed with the parameters provided by you. See the attached MS Word file. I do not claim this model is fool proof.
I invite others to comment on it.
By the way you are requested to let me know :
(1) How did you work out the lateral force, moment and the uplift force ?
(2) Why cannot you try footings, that will offer good resistance against uplift and rotation, in lieu of short piles ?

E S Jayakumar



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saikiran gone
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PostPosted: Fri Sep 09, 2016 6:05 am    Post subject: Reply with quote

Dear JayaKumar Sir,

Thank you very much for your valuable reply and your effort in solving my problem.

Sir, actually I am designing a foundation to the solar panels for one of the client. The support reactions are submitted by the tracker company(Exosun). Kindly find the attachment of the support reactions for the pile design  I used (Refer Sec 5.5)

Kindly find the excel sheet I developed to design pile foundation for your review, if any observations let me know.

Thank You,

Regards,
Saikiran.



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es_jayakumar
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PostPosted: Fri Sep 09, 2016 9:16 am    Post subject: Reply with quote

Er. Saikiran,
Your literature seems very exhaustive.... Is it mentioned somewhere in it, pile foundation should be used ? In my opinion, a square pad footing with a small square stub column at its centre to support the solar structure is apt.

E S Jayakumar
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saikiran gone
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PostPosted: Sat Sep 10, 2016 5:27 am    Post subject: Reply with quote

Sir,

Yes client is mentioned to use pile foundation. Sir,in Staad file given by you in the last post, why you released the moment sir.

Thank You,

Regards,
Saikiran.
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es_jayakumar
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PostPosted: Sun Sep 11, 2016 11:46 am    Post subject: Reply with quote

We can judiciously select the type of foundation based on the site conditions with the loads supplied by the manufacturer. You can go for the pad footing as suggested by me, keeping in view its credibility in resisting the uplift forces. You can maually design it. Uplift capacity of a very short pile may be low.
The idealised support provided to represent the soil spring should enable the beam segment to rotate in the loading plane (ie, X-Y plane). Hence MZ was released in that plane at supports.

E S Jayakumar
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knsheth123
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PostPosted: Mon Sep 12, 2016 5:04 am    Post subject: Reply with quote

Dear Er. SaiKiran


Pl. find the tool for calculation of lateral load capacity of short and long pile. It is based on linear springs for layered soil. The lateral subgrade modulus shall be based on IS 2911.

Brief formulation and verification problems are also attached.

Note: A pile for shallow depth is not used for lateral load resistance. Due to seasonal moisture variation and rain, a part of pile already remain detached to the pile. It reduces the capacity significantly.

If at all, this is to be adopted, it is advised to connect all piles by grade beams. This will change the end condition from free to partially fixed. Even the wind moment will be distributed between beams and pile.

With Regards

K. N. Sheth



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es_jayakumar
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PostPosted: Tue Sep 13, 2016 5:04 am    Post subject: Reply with quote

Dear Sheth Sir,
The Excel sheet does not work, as an alert concerned with Macros is displayed. How to tackle it ?

E S Jayakumar
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saikiran gone
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PostPosted: Fri Sep 16, 2016 6:01 am    Post subject: Reply with quote

Thank you Knsheth sir, for your info.

Sir kindly review sheet developed by me if possible.

Thank You,
Regards,

Saikiran.



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Final Pile Design Sheet.rar
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knsheth123
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PostPosted: Fri Sep 16, 2016 1:39 pm    Post subject: Reply with quote

Dear Er. Jaykumar

Wen you open .xls file, pl. clicK on the excel message "enable macro".
This should resolve the problem.

With Regards,

K. N. Sheth
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