Engineered Cementitious Composites Material

This command is used to construct a uniaxial Engineered Cementitious Composites (ECC)material object based on the ECC material model of Han, et al. (see references). Reloading in tension and compression is linear.

uniaxialMaterial ECC01 $matTag $sigt0 $epst0 $sigt1 $epst1 $epst2 $sigc0 $epsc0 $epsc1 $alphaT1 $alphaT2 $alphaC $alphaCU $betaT $betaC

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$matTag	integer tag identifying material
$sigt0	tensile cracking stress
$epst0	strain at tensile cracking stress
$sigt1	peak tensile stress
$epst1	strain at peak tensile stress
$sigt2	ultimate tensile strain
$sigc0	compressive strength (see NOTES)
$epsc0	strain at compressive strength (see NOTES)
$epsc1	ultimate compressive strain (see NOTES)
$alphaT1	exponent of the unloading curve in tensile strain hardening region
$alphaT2	exponent of the unloading curve in tensile softening region
$alphaC	exponent of the unloading curve in the compressive softening
$alphaCU	exponent of the compressive softening curve (use 1 for linear softening)
$betaT	parameter to determine permanent strain in tension
$betaC	parameter to determine permanent strain in compression

NOTES

Compressive ECC parameters should be input as negative values.

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REFERENCES:

1. Han TS, Feenstra PH, Billington SL, "Simulation of Highly Ductile Fiber-Reinforced Cement-Based Composite Components Under Cyclic Loading," ACI Structural Journal, V. 100, No. 6, pp. 749-757.

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Code Developed by: Won Lee, Stanford and Sara Billington, Stanford