# 4.14.5.14. Limit State Material¶

uniaxialMaterial('LimitState', matTag, s1p, e1p, s2p, e2p, s3p, e3p, s1n, e1n, s2n, e2n, s3n, e3n, pinchX, pinchY, damage1, damage2, beta, curveTag, curveType)

This command is used to construct a uniaxial hysteretic material object with pinching of force and deformation, damage due to ductility and energy, and degraded unloading stiffness based on ductility. Failure of the material is defined by the associated Limit Curve.

 matTag (int) integer tag identifying material s1p e1p (float) stress and strain (or force & deformation) at first point of the envelope in the positive direction s2p e2p (float) stress and strain (or force & deformation) at second point of the envelope in the positive direction s3p e3p (float) stress and strain (or force & deformation) at third point of the envelope in the positive direction s1n e1n (float) stress and strain (or force & deformation) at first point of the envelope in the negative direction s2n e2n (float) stress and strain (or force & deformation) at second point of the envelope in the negative direction s3n e3n (float) stress and strain (or force & deformation) at third point of the envelope in the negative direction pinchX (float) pinching factor for strain (or deformation) during reloading pinchY (float) pinching factor for stress (or force) during reloading damage1 (float) damage due to ductility: D1(m-1) damage2 (float) damage due to energy: D2(Ei/Eult) beta (float) power used to determine the degraded unloading stiffness based on ductility, m-b (optional, default=0.0) curveTag (int) an integer tag for the Limit Curve defining the limit surface curveType (int) an integer defining the type of LimitCurve (0 = no curve, 1 = axial curve, all other curves can be any other integer)

Note

• negative backbone points should be entered as negative numeric values

See also

Notes