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looking for help

as the topic ,i wander how to define the recorder of shear deformation of beamwithhinge element.
i am a new study of opensees.it is very appreciate for anyone who help me.

如题，在opensees中怎么操作，比如定义一个双线性弯矩曲率本构关系，用beamwithhinge单元，是要用到截面还是可以直接在beamwithhinge单元里面直接定义？求大神解答！

as the topic,i want to set up a Parallel model in my research.as we know BWBN model can't simulate Isotropic hardening.but hardening can get it. i met this problem in my research,but i have no ideal to set up a Parallel model.they are two different materials,and i want they work at the same element ...

i try to simulate a low cycle pushover column.but the initial stiffness is different from,or to say,much smaller then the test.the yield load is similar to that of test.i want to know how to control the stiffness of my simulation.or what Play a decisive role on the test?

FRP加固柱或梁等结构，怎么模拟加固效果？求教大佬

我在框架底部加了Iso2spring单元，用的是0长度截面，支座单元一端固接，一端只约束转角， 约束转角的一端连接框架主题。对框架进行时程分析，运行出错了。部分命令如下： fix 117 1 1 1 1 1 1; fix 126 0 0 0 1 1 1; section Iso2spring 1 1.0e-10 2000 100000 300 720000 610.0 982000000 0.0；#单位mm element zeroLengthSection 260 117 126 1 et pi 3.14159265; set xDamp 0.05; set nEigenI 1; set n...

i want to use Iso2spring section to make a Dynamic analyse in 1*1 frame .but the model work wrong like this: ProfileSPDLinDirectSolver::solve() - aii < 0 (i, aii): (8, 0). what's wrong with the model? help please! here is the model code : wipe model basic -ndm 2 -ndf 3; node 1 0 0; node 2 6000 0; no...

opensees work wrong like this.what's wrong with this? asking for help!
ProfileSPDLinDirectSolver::solve() - aii < 0 (i, aii): (8, 0)

element twoNodeLink 300 112 104 -mat 4 4 4 -dir 1 2 3 -orient -4.0 0.0 3.5 0.0 -1.0 0.0 twonodelink element work faired like this: UMD2FA: matrix is singular. Only 648 pivots found. WARNING UmfpackGenLinSolver::solve(void)- 4 returned in factorization UMD2FA() WARNING NewtonRaphson::solveCurrentStep...

i want to define a two node link element,the code like this: element twoNodeLink 300 121 104 -mat 4 4 4 -dir 1 2 6 -orient 1 0 0 1 0 1 but the opensees work wrong.like this: WARNING TwoNodeLink::setUp() - element: 300 ignoring nodes and using specified local x vector to determine orientation. what s...

i want to create a element LeadRubberX to define a Rubber bearing.it was used in a 3D frame.the element is zero length and when suffering a earthquake load ,the opensees work failed like this: UMD2FA: matrix is singular. Only 648 pivots found. WARNING UmfpackGenLinSolver::solve(void)- 4 returned in ...

thanks for your reply.i will take it.

i want to put out the strain and stress of a zerolength element? how to make it? by the way, i did not define a fiber section.

thanks for your answer.it works well.