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## Robot Structural Analysis

Active Contributor
Posts: 36
Registered: ‎04-26-2012

# HiRe: Please Tutorial creative Pile Raft foundation ???

10-06-2012 04:13 AM in reply to: Artur.Kosakowski

Hi all.

I know there are many ways  KX, KY, KZ (kN/m) .You can share how to calculate the coefficient of that for me,????? thank All.

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Valued Contributor
Posts: 76
Registered: ‎06-02-2012

# Re: HiRe: Please Tutorial creative Pile Raft foundation ???

10-08-2012 06:43 AM in reply to: nhandayasd

Hi

You must have the soil data in order to calculate the kx,ky and kz values

1 you can have the ks subgrade modulus from your soil data

or

2 if you think about the posible reactions involved :

the (horizontal) kx and ky are the passive soil values

To be conservative try to use Ko values for a first approach

because the Kp values need more displacements in order to be effective

The Kz values can be assigned to the internal pile nodes (see the file send by Artur)

those values varies with depth and for each soil layer

Kz=Ka*Sz*tan(j)*m

Sz = gamma soil*h

j= internal friction angle

m=2*pi*r*tl

tl=layer thicknes

(sorry no symbol font avalilable)

assigning a unique Kz value for all the nodes the reactions can you mislead to interpret the results

and the Rz reaction at the tip of the pile must be also wrong.

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Active Contributor
Posts: 36
Registered: ‎04-26-2012

# Re: HiRe: Please Tutorial creative Pile Raft foundation ???

10-08-2012 05:57 PM in reply to: rioja

Thank you for taking the time to answer me.
Can you tell me the formula name "KZ = Ka * Sz * tan (j) * m."
Can you tell me more about KX, Ky.

can you tell me any books about KX, KY, KZ best?
Thank again

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Valued Contributor
Posts: 76
Registered: ‎06-02-2012

# Re: HiRe: Please Tutorial creative Pile Raft foundation ???

10-09-2012 02:11 PM in reply to: nhandayasd

Laumans (1977) about ks

Schiel (1960)

or Grundbau - Taschenbuch ISBN 3-433-01412-4

All in german

look this page Kapitel 2, it is very interesting how they solve