4.14.4.3. QzSimple1 Material

uniaxialMaterial('QzSimple1', matTag, qzType, qult, Z50, suction=0.0, c=0.0)

This command is used to construct a QzSimple1 uniaxial material object.

matTag (int) integer tag identifying material
qzType (int)

qzType = 1 Backbone of q-z curve approximates Reese and O’Neill’s (1987) relation for drilled shafts in clay.

qzType = 2 Backbone of q-z curve approximates Vijayvergiya’s (1977) relation for piles in sand.

qult (float) Ultimate capacity of the q-z material. SEE NOTE 1.
Z50 (float) Displacement at which 50% of qult is mobilized in monotonic loading. SEE NOTE 2.
suction (float) Uplift resistance is equal to suction*qult. Default = 0.0. The value of suction must be 0.0 to 0.1.*
c (float) The viscous damping term (dashpot) on the far-field (elastic) component of the displacement rate (velocity). Default = 0.0. Nonzero c values are used to represent radiation damping effects.*

Note

  1. qult: Ultimate capacity of the q-z material. Note that q1 or qult are stresses [force per unit area of pile tip] in common design equations, but are both loads for this uniaxialMaterial [i.e., stress times tip area].
  2. Y50: Displacement at which 50% of pult is mobilized in monotonic loading. Note that Vijayvergiya’s relation (qzType=2) refers to a “critical” displacement (zcrit) at which qult is fully mobilized, and that the corresponding z50 would be 0. 125zcrit.
  3. optional args suction and c must either both be omitted or both provided.

See also

Notes