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 |
| $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.
REFERENCES:
- 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.
Code Developed by: Won Lee, Stanford and Sara Billington, Stanford