The OpenSees Community

Hello to everyone, I'm trying to model an Elastic-Perfectly Plastic behavior adopting EPP material, but I need to have only-compression behavior. In particular, with two branches for positive displacements and two for negative displacements (please see the attached figure in the dropbox link). I'm t...

Hello, I'm having some trouble with the node recorder command when recording accelerations. If I use the UniformExcitation pattern, the outputs will be relative displacements and accelerations. However, according to the guide for nodeRecorder command, if I use: recorder Node -file nodesA.out -timeSe...

Dear Professor Scott, thank you very much for your quick reply. I tried to remove the loadPattern 3, but the problem still arise. I've solved by using Multiple support command instead of pattern Plain. set patternTag 3; pattern MultipleSupport $patternTag { timeSeries Path 100 -dt 0.005 -filePath "D...

Hi, I've a problem when trying to perform eigen analysis after a load pattern that imposes a known displacement path adopting sp command: pattern Plain 3 "Series -dt $dt -filePath $DispHistory1 -factor 1.0" { sp 1002 1 1.0 sp 1003 1 1.0 } where DispHistory1 is a txt file containing a displacement ti...

Hello to everyone! I was using the 3.0.3 version of Opensees but there were some problems. In particular, when trying to use the nDMaterial PlaneStressUserMaterial the software gave me this output: "PSUMAT - NOT DEFINED IN THIS VERSION, SOURCE CODE RESTRICTED". So I decided to upgrade to newest vers...

Hello! I would kindly ask if exists a procedure to call a single material from matlab (for instance the pinching4 material) (i.e., without implementing the whole pinching4 hysteretic behavior in matlab). This would be particularly interesting when performing a calibration of the pinching4 parameters...

Hi to everyone, I got a problem with the parallel material when trying to use the command "-factors". The parallel material works fine when unitary factors are implicitly assumed (i.e., the command is uniaxialMaterial Parallel $coreID($xi) 701 56), but when trying to combine materials with different...

Hi, I've a problem when running the opensees example for MVLEM. The output is: "WARNING: numeric analysis returns 1 -- Umfpackgenlinsolver::solve WARNING NewtonRaphson::solveCurrentStep() -the LinearSysOfEqn failed in solve() StaticAnalysis::analyze() - the Algorithm failed at iteration: 0 with doma...

Hi,
if possible, I'd be grateful if the pinching4 material is added to the next version of Opensees.

Thanks,
Marco.

Hi, I've a problem with the axial load in a forceBeamColumn. I'm using this element to model the nonlinear beam-column in series with the limit state material, but the applied axial load varies during the analysis although the element has not yet failed axially. I'm using the displacement control mo...

Actually, I've to run about 48000 NTHs in wich I apply two sequential records to a 7floor-8span building modeled with limit state material. I'll use a grid computer to run parallel analyses and, given that the RAMs used by OpenSees always increases also if the single NTH is complete, I would like to...

In this zeroLength element I got two uniaxialMaterial elastic (with very high stiffness) and a Pinching4 material. If I eliminate the Pinching4 material the commands work. The problem is that I'm trying to use a joints scissor model that provides each parameter for this material. Can the commands Da...

Hi, I've the same problem when I'm trying to use Opensees parallel to perform Incremental Dynamic Analyses for several earthquakes. Every time that a single Nonlinear Time Hystory is complete, the RAM memory required however increases unless i close the program. I also tried to erase model and outpu...

I'm trying several combinations for the recorder, but I've no output. If I have a zerolength element with tag 1111 and the tag for shear limit state material associated to this element is 3111, in order to record in real time the CstateFlag, have I to write: set CstFlag [eleResponse 1111 stateFlag] ...

Hi , I'm trying to use the DataBase command in order to allow the use of save and restore commands for my model. I tried this command with related command "save" on a small model and it worked, but when I'm trying to use with a bigger model, using the same materials and elements, this command gives ...