Search found 533 matches

by mhscott
Mon Mar 01, 2021 5:39 am
Forum: OpenSees.exe Users
Topic: Lumped Mass system
Replies: 2
Views: 52

Re: Lumped Mass system

Do not use the Linear algorithm if you have nonlinear response! Use Newton.
by mhscott
Sun Feb 28, 2021 6:14 am
Forum: OpenSees.exe Users
Topic: MDOF lumped mass model
Replies: 4
Views: 79

Re: MDOF lumped mass model

No
by mhscott
Sat Feb 27, 2021 6:08 am
Forum: OpenSees.exe Users
Topic: MDOF lumped mass model
Replies: 4
Views: 79

Re: MDOF lumped mass model

Eigenvalue analysis is not required to do response history analysis.
by mhscott
Thu Feb 25, 2021 5:38 am
Forum: OpenSeesPy
Topic: Openseespy can't calculate all seismic load steps completely
Replies: 2
Views: 85

Re: Openseespy can't calculate all seismic load steps completely

Please provide more details. Are you sure the models are exactly the same?
by mhscott
Sun Feb 21, 2021 9:17 pm
Forum: OpenSeesPy
Topic: WARNING element type ShellNLDKGT is unknown
Replies: 1
Views: 69

Re: WARNING element type ShellNLDKGT is unknown

Thanks for reporting this. Looks like this element is in Tcl but not in the Python interpreter for some reason. I will add it.
by mhscott
Wed Feb 17, 2021 6:00 am
Forum: OpenSees.exe Users
Topic: only-compression material
Replies: 1
Views: 76

Re: only-compression material

Use Hysteretic or MultiLinear material and set the strength values on the tension side to be very low. It's not elegant, but it should work.
by mhscott
Wed Feb 17, 2021 5:57 am
Forum: OpenSees.exe Users
Topic: When buckling analysis in OpenSees?
Replies: 1
Views: 76

Re: When buckling analysis in OpenSees?

Probably not. But you can perform direct analyses to get buckling loads: https://wp.me/pbejzW-Bh
by mhscott
Wed Feb 17, 2021 5:52 am
Forum: OpenSeesPy
Topic: Adding new p-y material in opensees
Replies: 2
Views: 123

Re: Adding new p-y material in opensees

Develop it as p-y. Uniaxial materials are scalar functions and have no inherent meaning. The calling objects treat the functions appropriately.
by mhscott
Mon Feb 15, 2021 6:59 am
Forum: OpenSees.exe Users
Topic: Step time dependent material
Replies: 5
Views: 203

Re: Step time dependent material

It could be an error in the material state determination, or in how you set up the testing script. I can't really tell.
by mhscott
Fri Feb 12, 2021 5:29 am
Forum: OpenSees.exe Users
Topic: Step time dependent material
Replies: 5
Views: 203

Re: Step time dependent material

You can get the time step from ops_Dt, a global variable. Search the source code for it. You can see an example in BilinearOilDamper.cpp.
by mhscott
Thu Feb 11, 2021 5:59 am
Forum: OpenSees.exe Users
Topic: Hysteretic material
Replies: 1
Views: 656

Re: Hysteretic material

No, you can only define three points on the backbone of the HystereticMaterial.
by mhscott
Sat Feb 06, 2021 7:46 am
Forum: OpenSees.exe Users
Topic: ArpackSolver::Error with _saupd info = -9999
Replies: 2
Views: 440

Re: ArpackSolver::Error with _saupd info = -9999

Try asking for one or two modes instead of five.
by mhscott
Thu Feb 04, 2021 1:39 pm
Forum: OpenSeesPy
Topic: Question on the best practice to run multiple OpenSeesPy sessions in parallel
Replies: 2
Views: 761

Re: Question on the best practice to run multiple OpenSeesPy sessions in parallel

This presentation by Dr. Minjie Zhu describes parallel computing with OpenSeesPy very well: https://youtu.be/vjGm2kM5Ihc
by mhscott
Tue Feb 02, 2021 12:56 pm
Forum: OpenSeesPy
Topic: fiber section stress-strain output through recorder command
Replies: 9
Views: 1613

Re: fiber section stress-strain output through recorder command

This will be fixed in the next version of OpenSeesPy. For now, use str() like described here: https://wp.me/pbejzW-Si
by mhscott
Tue Feb 02, 2021 12:52 pm
Forum: OpenSeesPy
Topic: Warning material type FluidSolidPorousMaterial is unknown
Replies: 3
Views: 450

Re: Warning material type FluidSolidPorousMaterial is unknown

Thanks! I will update the documentation.