Elastic-Perfectly Plastic Gap Material

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This command is used to construct an elastic perfectly-plastic gap uniaxial material object.

uniaxialMaterial ElasticPPGap $matTag $E $Fy $gap <$eta> <damage>

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$matTag	integer tag identifying material
$E	tangent
$Fy	stress or force at which material reaches plastic state
$gap	initial gap (strain or deformation)
$eta	hardening ratio (=Eh/E), which can be negative
$damage	a switch to accumulate damage in the material. If damage is omitted, default value, the gap material "re-centers" on load reversal.

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Code Developed by: krm