Concrete01 Material With Stuff in the Cracks

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This command is used to construct a modified uniaxial Kent-Scott-Park concrete material object with degraded linear unloading/reloading stiffness according to the work of Karsan-Jirsa and no tensile strength. The modification is to model the effect of Stuff In The Cracks (SITC). The command is as follows:

uniaxialMaterial Concrete01WithSITC $matTag $fpc $epsc0 $fpcu $epsU <$endStrainSITC>

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$matTag	integer tag identifying material
$fpc	concrete compressive strength at 28 days (compression is negative)*
$epsc0	concrete strain at maximum strength*
$fpcu	concrete crushing strength *
$epsU	concrete strain at crushing strength*
$endStrainSITC	optional, default = 0.03

NOTE:

• Compressive concrete parameters should be input as negative values.

• The initial slope for this model is (2*$fpc/$epsc0)

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REFERENCES:

J.F. Stanton and H.D. McNiven, "The Development of a Mathematical Model to Predict the Flexural Response of Reinforced Concrete Beams to Cyclic Loads, Using System Identification", EERC Report Number 79/02, January 1979.

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Code Developed by: Won Lee, Stanford