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HOW TO CALCULATE NUMBER OF PILES

 
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mohd_arastu
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Joined: 21 Dec 2011
Posts: 15
Location: Delhi

PostPosted: Mon Sep 23, 2013 1:20 pm    Post subject: HOW TO CALCULATE NUMBER OF PILES Reply with quote

DEAR SEFIEANS

PLEASE GUIDE ME...HOW TO CALCULATE THE NUMBER OF PILES.

I HAVE PILE CAPACITY AS FOLLOWS

1. HORIZONTAL CAPACITY = 44KN
2. COMPRESSION CAPACITY = 280KN
3. UPLIFT/TENSION CAPACITY  = 175KN

I HAVE REACTION AT EACH NODE FROM STAAD FOR 17 DIFFERENT LOAD CASES IN THE FORM OF:

FY, FX, FZ, MX, MY, MZ
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pravin_shirsath
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Joined: 23 Jan 2011
Posts: 65

PostPosted: Tue Sep 24, 2013 11:31 am    Post subject: Reply with quote

no of piles are depends upon lateral load as well as Vetical load.

1) lateral load = sqrt(fx2 + fz2)

no of piles = lateral load/lateral capacity


2) Vertical load increased by approximate 20% for moments

no of piles =Vertical load /vertical capacity


Hence no of piles max of (1) & (2)
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mohd_arastu
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Joined: 21 Dec 2011
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Location: Delhi

PostPosted: Tue Sep 24, 2013 1:21 pm    Post subject: Reply with quote

Thanks Mr. Pravin

in case of uplift?


should Self weight of pile cap added to Fy? if yes then how much percentage of Fy?



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pravin_shirsath
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Joined: 23 Jan 2011
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PostPosted: Wed Sep 25, 2013 3:46 am    Post subject: Reply with quote

most of time uplift not governing,unless transmission tower (slender structures).

20% is ok as pile cap weight will be marginal comapre to total weight.

most of time lateral capacity & vertical loads governs.
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Siva Agathamudi
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Joined: 09 Jun 2016
Posts: 10

PostPosted: Mon Nov 13, 2017 6:14 am    Post subject: Number of piles with moment and axial force Reply with quote

Dear Mr.Shirsath,


How to find the number of piles with biaxial moment and vertical capacity.
How should i convert the moments into axial force...



Regards,
Siva
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1086
Location: Cochin

PostPosted: Fri Nov 17, 2017 1:08 am    Post subject: Reply with quote

You may please refer the book "Reinforced Concrete Vol-I" by H.J.Shah (Charotar), to clarify your query.

E S Jayakumar
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