Hyperbolic Gap MaterialΒΆ

uniaxialMaterial('HyperbolicGapMaterial', matTag, Kmax, Kur, Rf, Fult, gap)

This command is used to construct a hyperbolic gap material object.

matTag (int)

integer tag identifying material

Kmax (float)

initial stiffness

Kur (float)

unloading/reloading stiffness

Rf (float)

failure ratio

Fult (float)

ultimate (maximum) passive resistance

gap (float)

initial gap


  1. This material is implemented as a compression-only gap material. Fult and gap should be input as negative values.

  2. Recomended Values:

    • Kmax = 20300 kN/m of abutment width

    • Kcur = Kmax

    • Rf = 0.7

    • Fult = -326 kN per meter of abutment width

    • gap = -2.54 cm

See also