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I have solved this problem, the sectiion number is the integration number of element.
But I still can't use bond_slip zero length element.
Can you help me?

Dear everyone, I am now using OS to simulate a concrete pier under cyclic lateral load on the top. I find it is difficulty to use zerolength element to simulate the strain penetration effects. So I give up the zerolength element in the model. But I want to output the section stressstrain with the el...

Dear everyone, Dear Silvia,Frank,Michael I use uniaxialMaterial Bond_SP01 and zeroLengthSection element to simulate a segmental precast column pier under the cyclic load of test. But can't convergent.I add the equalDOF to the zerolength element to add shear boundary to the zerolength element of coml...

what units you use?
the element length is 100,
the area of steel bar is about 0.001?
your quad fiber length in IJ direction is about 1,while in IK direction is about 0.06,so the fiber is not very good.

WARNING SuperLU::solve(void)- Error 6 returned in factorization dgstrf()
DisplacementControl::newStep(void) - failed in solver
StaticAnalysis::analyze() - the Integrator failed at iteration: 0 with domain at
load factor 0
OpenSees > analyze failed, returned: -2 error flag
-2

Maybe the fiber section defination has some error.
You can try to change the fiber divid numbers of section.

Dear fmk,
The command manual has no such parameter in steel02 material.
Such as initial stress or strain.
Can you give me some advice?

ok,I see what you mean.
Thanks a lot to you.

uniaxialMaterial StrPen01 parameter is not shown in the command manual of example SS_ic1.tcl in page 53.
Can you explain the parameter $Cd 's meaning?

thank you very much.
I have found some in Journal Papers.

I have download a command manual,but have not the theory manual. I am now use OS in the cycle lateral displace analysis of reinfoced concrete column.In the tcl command file, I select the concrete02 and steel02 material respectly for concrete and rebar.But I can't find detailed explaination about the...