When I using ECC01, the Compressive Behavior does not act like the LINEAR elastic, in fact it has larger elastic modulus than value that I has set at the beginning and gradually elastic modulus reduce when strain move towards epsc0.
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set Ec [expr 42200*$MPa]
set sigc0 [expr -126*$MPa]; #$sigc0 compressive strength (see NOTES)
set epsc0 [expr $sigc0/$Ec]; #$epsc0 strain at compressive strength
set epsc1 [expr -0.4]; #$epsc1 ultimate compressive strain (see NOTES)
set sigt1 [expr 7.1*$MPa];#$sigt1 peak tensile stress
set epst1 [expr 0.002]; #$epst1 strain at peak tensile stress
set epst2 [expr 0.008125]; #$sigt2 ultimate tensile strain
set sigc0 [expr -126*$MPa]; #$sigc0 compressive strength (see NOTES)
set epsc0 [expr $sigc0/$Ec]; #$epsc0 strain at compressive strength
set epsc1 [expr -0.4]; #$epsc1 ultimate compressive strain (see NOTES)
set alphaT1 [expr 6]; #$alphaT1 exponent of the unloading curve in tensile strain hardening region
set alphaT2 [expr 6]; #$alphaT2 exponent of the unloading curve in tensile softening region
set alphaC [expr 3]; #$alphaC exponent of the unloading curve in the compressive softening
set alphaCU [expr 1]; #$alphaCU exponent of the compressive softening curve (use 1 for linear softening)
set betaT [expr 0.4]; #$betaT parameter to determine p ermanent strain in tension
set betaC [expr 0.2]; #$betaC parameter to determine permanent strain in compression
uniaxialMaterial ECC01 20 $sigt0 $epst0 $sigt1 $epst1 $epst2 $sigc0 $epsc0 $epsc1 $alphaT1 $alphaT2 $alphaC $alphaCU $betaT $betaC
Can anyone told me why?
Thank you very much!