reference for p-y curve in opensees

[Mohammadafshar]

hi everybody
what is reference article to obtain p-y curve in this below page?"exactly includes figures for zb data.
# obtain loading-type coefficient A for given depth-to-diameter ratio zb
# ---> values are obtained from a figure and are therefore approximate
set zb(1) 0
set zb(2) 0.1250
set zb(3) 0.2500
set zb(4) 0.3750
set zb(5) 0.5000
set zb(6) 0.6250
set zb(7) 0.7500
set zb(8) 0.8750
set zb(9) 1.0000
set zb(10) 1.1250
set zb(11) 1.2500
set zb(12) 1.3750
set zb(13) 1.5000
set zb(14) 1.6250
set zb(15) 1.7500

http://opensees.berkeley.edu/wiki/index ... yParam.tcl
tnx

[fmk]

did you look at any of the 4 references provided?

[Mohammadafshar]

yes,but Unfortunately i cant find figures!

[mcganncr]

The figure in question is Figure 3.24 on page 86 of the listed reference:

Reese, L.C. and Van Impe, W.F. (2001), Single Piles and Pile Groups Under Lateral Loading. A.A. Balkema, Rotterdam, Netherlands.

which shows how the static and cyclic A coefficients vary with depth to diameter ratio (z/B). The values shown in this figure are roughly
equivalent to values returned by the equation presented in the newer API documents:

A = 3 - 0.8*(z/B) >= 0.9

which may be a slightly simpler way to estimate the A coefficient than what is implemented in that example.