4.14.5.22. Pinching4 Material¶
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uniaxialMaterial
('Pinching4', matTag, ePf1, ePd1, ePf2, ePd2, ePf3, ePd3, ePf4, ePd4, <eNf1, eNd1, eNf2, eNd2, eNf3, eNd3, eNf4, eNd4>, rDispP, rForceP, uForceP, <rDispN, rForceN, uForceN>, gK1, gK2, gK3, gK4, gKLim, gD1, gD2, gD3, gD4, gDLim, gF1, gF2, gF3, gF4, gFLim, gE, dmgType) This command is used to construct a uniaxial material that represents a ‘pinched’ load-deformation response and exhibits degradation under cyclic loading. Cyclic degradation of strength and stiffness occurs in three ways: unloading stiffness degradation, reloading stiffness degradation, strength degradation.
matTag
(int)integer tag identifying material ePf1
ePf2
ePf3
ePf4
(float)floating point values defining force points on the positive response envelope ePd1
ePd2
ePd3
ePd4
(float)floating point values defining deformation points on the positive response envelope eNf1
eNf2
eNf3
eNf4
(float)floating point values defining force points on the negative response envelope eNd1
eNd2
eNd3
eNd4
(float)floating point values defining deformation points on the negative response envelope rDispP
(float)floating point value defining the ratio of the deformation at which reloading occurs to the maximum historic deformation demand fFoceP
(float)floating point value defining the ratio of the force at which reloading begins to force corresponding to the maximum historic deformation demand uForceP
(float)floating point value defining the ratio of strength developed upon unloading from negative load to the maximum strength developed under monotonic loading rDispN
(float)floating point value defining the ratio of the deformation at which reloading occurs to the minimum historic deformation demand fFoceN
(float)floating point value defining the ratio of the force at which reloading begins to force corresponding to the minimum historic deformation demand uForceN
(float)floating point value defining the ratio of strength developed upon unloading from negative load to the minimum strength developed under monotonic loading gK1
gK2
gK3
gK4
gKLim
(float)floating point values controlling cyclic degradation model for unloading stiffness degradation gD1
gD2
gD3
gD4
gDLim
(float)floating point values controlling cyclic degradation model for reloading stiffness degradation gF1
gF2
gF3
gF4
gFLim
(float)floating point values controlling cyclic degradation model for strength degradation gE
(float)floating point value used to define maximum energy dissipation under cyclic loading. Total energy dissipation capacity is defined as this factor multiplied by the energy dissipated under monotonic loading. dmgType
(str)string to indicate type of damage (option: 'cycle'
,'energy'
)
See also