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RE: L-Pile Analysis

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If it is "output", it seems to me that the reaction would be in load per unit length of pile.  If it were "input", it likely would be a spring constant 'k' - but that would imply a constant spring value.  I believe that L-pile uses P-Y curves which involve a varying spring value with magnitude of deformation.
I sometimes use a computer model with springs uniformly spread along the length of the drilled pier to obtain an approximate lateral pile analysis. I vary the spring constant to bracket potential shears and moments on the pile. This is not as accurate as L-pile, but it seems that if lateral forces are not too high and deformations are limited this should provide a reasonable approximation of pier loads.

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)


From: Garner, Robert [mailto:rgarner(--nospam--at)]
Sent: Thursday, May 26, 2005 12:53 PM
To: seaint(--nospam--at)
Subject: RE: L-Pile Analysis

Arvel, I totally agree about using "black box" solutions, so I'm also analyzing the piles manually as a reality check.  And consulting with knowledgible engineers here.




From: Arvel L. Williams, P.E. [mailto:awilliams(--nospam--at)]
Sent: Thursday, May 26, 2005 11:22 AM
To: seaint(--nospam--at)
Subject: RE: L-Pile Analysis


If soil, - constant for lateral resistant k.  (Spring constant i.e. pounds resistance for inches deflection at that point on pile)


Don't recommend that you use L pile or any lateral load analysis software without understanding what the output means and how to establish the proper boundary conditions.  You can get some real bad output.



-----Original Message-----
From: Garner, Robert [mailto:rgarner(--nospam--at)]
Sent: Thursday, May 26, 2005 12:58 PM
To: seaint(--nospam--at)
Subject: L-Pile Analysis

I'm running the L-Pile analysis program for some laterally loaded piles.  It has output values for lbs. per inch along the length of the pile.  I don't have a manual for this program.  Does anyone know for sure what this output represents.  I need the lateral soil bearing values and I think this output has something to do with this but I really would like to know for sure.


Thanks in advance.


Bob Garner, S.E.


R. Garner

Moffatt & Nichol

Tel.:  (619) 220-6050

Fax.: (619) 220-6055

e-mail: rgarner(--nospam--at)