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They're the same to me.

Thank you fbeckwit for your help!

No one?

fbeckwit, thank you for your kind reply. The axial load is that large because I used SI(N,mm) unit. Actually I am just about to post that I've solved the problem by changing the unit from SI to English unit. I don't know why, maybe because the value of load in SI unit is too large causing some value...

Thank you fmk for your suggestion. However, Newton with initial stiffness also fails. Actually, all the reinforcing steel models fail. When ReinforcingSteel was used following errors appear: bad trial strain UniaxialMaterial::setTrial() - material failed in setTrialStrain() I checked the SR code of ...

anyone?

what is the difference between P-Delta and P-delta??

something like this??
uniaxialMaterial ElasticPPGap 11 $E1 $fy 0.0; # Tension
uniaxialMaterial ElasticPPGap 22 -10e-10 [expr -0.1*10e-10] 0.0 # Compression
uniaxialMaterial Parallel 1 11 22

Dear all, I want to model an FRP tube-confined concrete column under cyclic lateral loading. The FRP tubes bear axial load to some extent, but can not stand tension force. I'm using fiber-section beam-column element; ENT material is assigned for the FRP tube. However, it is very hard to converge. Wh...

No one helps?

fmk wrote:
> remove the sectionTag from the element recorder.
Dear fmk,
Thank you for your reply, but it still doesn't work for me!

We still don't know why stress-strain responses can not be extracted in zerolength section element, since the administrators are not replying. If we can, it will facilitate us a lot. Sometimes for dispBeamColumn element, the same problem occurs! While for forceBeamColumn, it works fine! I don't know...

Yes, maybe the code is tcl script. Could you share it please?

Oh, I see.
Could you please share it with us?
For calibrating material, I'm using just truss element similar to those in the Maxwell_Material in the document.
http://opensees.berkeley.edu/wiki/index ... l_Material

Thanks, Lost! I've tried as you suggested, unfortunately, it still doesn't work. The script is here: ------------------------------------------- set dataDir data; # set up name of data directory (can remove this) file mkdir $dataDir; # create data directory model basic -ndm 2 -ndf 3 ### Geometry and...