About Pinching4 material!

[popecl]

I have already defined the Pinching4 material using force-deformation relation to exhibit the cyclic degradation of strength and stiffness.

However, can I make use of the Pinching4 material to define a section which can be used in Nonlinear beam-column elements?

Can I define a fiber section using the Pinching4 material?

Thanks for your attention!

# Pinching 4 model
#units--Kn and m.
set MatTag 1;
set ePd1 0.065; set ePf1 449;
set ePd2 0.2; set ePf2 496;
set ePd3 0.39; set ePf3 562;
set ePd4 0.846; set ePf4 0;
set rDispP 0.4;
set rForceP 0.3;
set uForceP 0;
set dmgType "energy";
set gK1 1.0; set gK2 0.15; set gK3 0.3; set gK4 0.2; set gKLim 1.0;
set gD1 0.5; set gD2 0.5; set gD3 2.0; set gD4 2.0; set gDLim 0.5;
set gF1 1.0; set gF2 0; set gF3 1.0; set gF4 1.0; set gFLim 1.0;
set gE 20;
##
uniaxialMaterial Pinching4 $MatTag $ePf1 $ePd1 $ePf2 $ePd2 $ePf3 $ePd3 $ePf4 $ePd4 \
$rDispP $rForceP $uForceP \
$gK1 $gK2 $gK3 $gK4 $gKLim \
$gD1 $gD2 $gD3 $gD4 $gDLim \
$gF1 $gF2 $gF3 $gF4 $gFLim $gE $dmgType;

[silvia]

yes. you can use materials to define any "force"-"deformation" responses, such as moment-curvature, for example.

i almost want to change the name to something else.

[popecl]

If you have the model of nonlinear beam-column elements using the Pinching4 material, can you give several examples to me?
Thank you very much!

[els83]

silvia wrote:
> yes. you can use materials to define any
> "force"-"deformation" responses, such as
> moment-curvature, for example.
>
> i almost want to change the name to something else.

So, Is it Possible to use the Pinching4 material model with fiber section? I mean Can we assign it to fibers like stress-strain instead of force-deformation?

Thanks,

[vesna]

Yes, you can use it to assign stress-strain relationship to fibers of a fiber section.

[omalvarez]

Dear Vesna,
I have a question about backbone curve. I am working at a model, but I do not know how get a backbone curve, it can be moment-curvature or moment-rotation column diagram? How can I calibrate the model?
Best regards.

[mhscott]

Some information on calibration between moment-curvature and moment-rotation can be found here:

http://dx.doi.org/10.1193/1.4000136

[omalvarez]

Thank you so much professor Scott, then I can use moment-rotation or moment-curvature to characterize pinching4 material, its right?