Inelastic/EPP/Hysteretic/bilinear material

[Opensees87]

Hello,
I am trying to get the force deformation behavior of an inelastic material to get a bilinear curve. I am essentially trying to get this curve http://opensees.berkeley.edu/wiki/index ... 1_Material

I have been trying but I various errors like ForceBeamColumn2d..failed to get compatible forces and deformations and also convergence and integrator issues. This is what I am doing:

wipe;
model BasicBuilder -ndm 2 -ndf 3
file mkdir hyselasunisin0419

node 1 0.0 0.0
node 2 144.0 0.0

fix 1 0 1 0
fix 2 1 1 1

geomTransf Linear 1;
uniaxialMaterial Steel01 1 60 29000 0.01
section Uniaxial 2 1 P;
element nonlinearBeamColumn 1 1 2 5 2 1;

recorder Node -file hyselasunisin0419/Node2.txt -time -node 1 -dof 1 2 3 disp
recorder Element -file hyselasunisin0419/Elem1.txt -time -ele 1 force

set SinePath "Sine 0.0 15.0 1.0 -factor 1000"
pattern Plain 2 $SinePath {
load 1 5.0 0.0 0.0
}

system BandGeneral
constraints Plain
numberer Plain
test EnergyIncr 1.0e-15 100
algorithm Newton
integrator LoadControl 0.01
analysis Static
analyze 1500


Can someone tell me whats wrong with this? I tried changing the algorithm type etc. It doesn't run. I'd appreciate any help.
Thanks

[vesna]

What is the purpose of the script? Are you trying to test the material?

When in 2D you need to assign moment-curvature relationship to your section as well.

[civil]

does
uniaxialMaterial Bilinear $masstag $E $Fy_p $Fy_n $a_h $a_cap $d_cap_p $d_cap_n $flagCE $residu $DmgS $DmgK $DmgD
work in opensees 2.4?
i could not find this material in manual. i want to know what are its parameter. where can i find it?

is there any image of uniaxialMaterial Bilinear?

[fmk]

no. the stanford developers (now at mcGill, a.ak.a. Lignos) have replaced the original with Bilin. The Bilinear code is still in the repository if it is needed, as for the behaviour, if it is not in Arash's dissertation then no.

[civil]

Thanks dear Frank.
where can I find Arash's dissertation?
Bilin material is based on moment-rotation relationship but i want one based on force-displacement. could i use it?
Regards

[fmk]

http://opensees.berkeley.edu/OpenSees/d ... ation.pdf‎

[civil]

Hi dear all,
What is "flagCapenv" and how should be calculate? Has it only 0 or 1 value?

uniaxialMaterial Bilinear $masstag $elstk $fyieldPos $fyieldNeg $alfa $alfaCap $capDispPos $capDispNeg $flagCapenv $Resfac $strength $stiffness $capping

[civil]

Dear fmk
could you please answer my question?