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Point of fFixity in pile foundation design
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es_jayakumar
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PostPosted: Sun Sep 18, 2016 2:44 am    Post subject: Reply with quote

Dear Sheth Sir,
Please demonstrate the worked out example of a laterally loaded pile taken from text book, in your Excel sheet.

Regards,
E S Jayakumar



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saikiran gone
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PostPosted: Sun Sep 18, 2016 3:23 pm    Post subject: Reply with quote

Dear Sheth Sir,

I have given the input in the excel sheet from the textbook given by Jayakumar sir . The result is not matching with the textbook result viz..

Textbook for H = 30 Kn Y = 4mm
Excel sheet   H = 62.7 Kn y = 5mm. (Kindly find the Pdf file attached)

Can you please suggest, why the difference is more. Sir if possible give us the reference or worked example (Not VBA example) from which program is developed.Sir how you are calculating (Zf) point of fixity without graph input from the IS 2911 code.


Jayakumar sir, Can you give the textbook name from which example selected. Example selected by you is very precise.

Thank You,



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Dr. N. Subramanian
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PostPosted: Sun Sep 18, 2016 8:31 pm    Post subject: Reply with quote

Dear Er Saikiran,

From the look of the example, I could certainly say that the author of the book is Prof. Varghese, Foundation Engineering, Prentice Hall of India Pvt. Ltd.
Best wishes
NS
saikiran gone wrote:
Dear Sheth Sir,

I have given the input in the excel sheet from the textbook given by Jayakumar sir . The result is not matching with the textbook result viz..

Textbook for H = 30 Kn Y = 4mm
Excel sheet   H = 62.7 Kn y = 5mm. (Kindly find the Pdf file attached)

Can you please suggest, why the difference is more. Sir if possible give us the reference or worked example (Not VBA example) from which program is developed.Sir how you are calculating (Zf) point of fixity without graph input from the IS 2911 code.


Jayakumar sir, Can you give the textbook name from which example selected. Example selected by you is very precise.

Thank You,
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es_jayakumar
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PostPosted: Mon Sep 19, 2016 3:02 am    Post subject: Reply with quote

Yes, it is.... ....This style of presentation of worked out examples is the masterpiece of Prof. Varghese !!!
Sheth sir is requested to tally this worked out example with his spread sheet, please.

E S Jayakumar
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knsheth123
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PostPosted: Mon Sep 19, 2016 12:43 pm    Post subject: Reply with quote

Dear Er. Jayakumar

In the worksheet posted, it calculates capacity at 5mm deflection. For the Data from the book by Prof. P. C. Verghese, lateral capacity for 5mm deflection is 36 kN.

To calculate defelction for 30 kN load, the sheet updated and the answer is 4.20 mm.


Pl. note the fem formulation used with 150 element for 15m length is close to the closeform solution. The graphs IS Code are little simplified solution (Prof. Swami Saran - Substructure Analysis)

With warm Regards

K. N. Sheth

n.b. : Amazed to find sharp memory of respected N. S. Sir to identify a book in Foundation Engg.



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es_jayakumar
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PostPosted: Tue Sep 20, 2016 4:48 am    Post subject: Reply with quote

Dear Sheth sir,
In your Excel sheet, what is meant by "number of elements" ? Can you please upload the above Excel sheet, that demonstrates the worked out example ?

Regards,
E S Jayakumar
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saikiran gone
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PostPosted: Tue Sep 20, 2016 12:18 pm    Post subject: Reply with quote

Dear Jayakumar Sir,

"Number of Elements" in the excel sheet is, the number of parts to divide the pile length for finite analysis.

In attached pdf , it was 150 i.e 15m pile length is subdivided into 150 elements, 0.1m length/ element for finite element analysis.

Thank You,

Regards,
Saikiran.
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knsheth123
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PostPosted: Tue Sep 20, 2016 12:41 pm    Post subject: Reply with quote

Dear Er. Jayakumar

Pl. find the worksheet updated for deflection calculations.

Present solution uses fem. The pile segment in each layer is divided in no. of finite size elements. The accuracy for small no. of element is less and it converge with increasing no. of elements in each pile segment. As the no. of element increases time taken to run the program increases. For the present case element of 0.1 to 0.2m will be ok.

Hence no. of element for the present case, I put 150 (15m length). If the solution does not alter increasing no. of elements means the problem is converged.

With Regards

K. N. Sheth



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saikiran gone
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PostPosted: Tue Sep 20, 2016 6:03 pm    Post subject: Point of fFixity in pile foundation design Reply with quote

Dear sheth sir,

How to use your excel sheet if the soil is the combination of C & Phi soil.

Thanks,

Regards,
Saikiran.
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saikiran gone
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PostPosted: Sat Sep 24, 2016 12:39 pm    Post subject: Re: Point of fFixity in pile foundation design Reply with quote

saikiran gone wrote:
Dear sheth sir,

How to use your excel sheet if the soil is the combination of C & Phi soil.

Thanks,

Regards,
Saikiran.


Dear sheth sir,

Can I know, how to use your excel sheet if the soil is the combination of C & Phi soil.

Thanks,

Regards,
Saikiran.
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