Elastic-Perfectly Plastic Gap (EPP Gap)

Description

The ElasticPPGap, or EPPGap, material is a model of one-dimensional perfect plasticity that can be used anywhere a UniaxialMaterial object is expected in OpenSees. The initial gap can be in tension or compression and the gap can increase in magnitude when the damage option is utilized. The material also includes an option for strain hardening. The EPPGap material is suitable for modeling bridge abutments with zero length elements.

Syntax

ops.uniaxialMaterial('ElasticPPGap',tag,E,Fy,gap)
ops.uniaxialMaterial('ElasticPPGap',tag,E,Fy,gap,eta)
ops.uniaxialMaterial('ElasticPPGap',tag,E,Fy,gap,eta,'damage')

Parameters

tag : integer Unique material identifer
E : float Elastic modulus
Fy : float Yield stress
gap : float Initial gap (should have the same sign as Fy)

Optional Parameters

eta : float Strain hardening ratio (default=0), Eh=eta*E
damage : string When present, the initial gap will increase in magnitude

Examples

ops.uniaxialMaterial('ElasticPP',1,5000,400,0.1)

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