4.14.5.35.1.8. ReeseStiffClayAboveWS

hystereticBackbone('ReeseStiffClayAboveWS', backboneTag, pu, y50)

The backbone function is defined in this manual in page 336

backboneTag (int)

integer tag identifying the backbone function.

pu (float)

see below

y50 (float)

see below
../_images/ReeseStiffClayBelowWS.png

4.14.5.35.1.8.1. pu

Obtain values for undrained shear strength \(c\), soil unit weight \(\gamma\), and pile diameter \(b\). Also obtain the values of \(\varepsilon_{50}\) from stress-strain curves. If no stress-strain curves are available, use a value from \(\varepsilon_{50}\) of 0.010 or 0.005 as given in the following table, the larger value being more conservative.

Consistency of Clay

\(\varepsilon_{50}\)

Soft

0.020

Medium

0.010

Stiff

0.005

Compute the ultimate soil resistance per unit length of shaft, \(p_u\), using the smaller of the values given by the following equations

\[p_u = (3 + \frac{\gamma'}{c}x+\frac{J}{b}x)cb p_u = 9cb\]

4.14.5.35.1.8.2. y50

Compute the deflection, \(y_{50}\) at one-half the ultimate soil resistance from the following equation

\[y_{50} = 2.5\varepsilon_{50}b\]