Search found 50 matches

by Ashok
Tue Jun 08, 2021 11:15 pm
Forum: OpenSeesPy
Topic: Request scientific articles/reference of theoretical analysis for fiber section
Replies: 1
Views: 352

Re: Request scientific articles/reference of theoretical analysis for fiber section

1) A FIBER BEAM-COLUMN ELEMENT FOR SEISMIC RESPONSE ANALYSIS OF REINFORCED CONCRETE STRUCTURES by Fabio F. Taucer, Research Assistant, Enrico Spacone, Doctoral Student and Filip C. Filippou - Associate Professor Report No. UCB/EERC-91/17 Earthquake Engineering Research Center College of Engineering ...
by Ashok
Tue Jun 08, 2021 9:39 pm
Forum: OpenSeesPy
Topic: Parametes from J2 plasticity model
Replies: 2
Views: 244

Re: Parametes from J2 plasticity model

Thanks a lot !
I tried it - but it shows the message:
"More than 25 iterations in constituive subroutine J2-plasticity "
by Ashok
Mon Jun 07, 2021 11:03 pm
Forum: OpenSeesPy
Topic: Parametes from J2 plasticity model
Replies: 2
Views: 244

Parametes from J2 plasticity model

Hi,
Can somebody tell me about the parameters in J2 plasticity.
nDMaterial('J2Plasticity', matTag, K, G, sig0, sigInf, delta, H)

What are delta and H ?
How to calibrate them from experimental stress-strain curve ?
by Ashok
Mon Jun 07, 2021 10:25 pm
Forum: OpenSees.exe Users
Topic: analyze failed
Replies: 2
Views: 262

Re: analyze failed

Lapack errors are because - there is some discontinuity in your model or no proper support i.e. your model is moving as a rigid body
by Ashok
Sat Apr 24, 2021 3:43 am
Forum: OpenSeesPy
Topic: Moment releases for 3-d elasticBeamColumn
Replies: 0
Views: 386

Moment releases for 3-d elasticBeamColumn

Hi, In the GitHub source of elasticBeamColumn3d, I see implementation of moment releases. Are they exposed to interpreters ? OpenSeesPy documentation talks only about 2d case. If anybody has used them in their local compilation, can you please tell me if they are working properly? What does 0,1,2,3 ...
by Ashok
Fri Apr 23, 2021 3:12 am
Forum: OpenSees.exe Users
Topic: Bridge Model with Truss and Beam-Column Elements OR End Moments Release
Replies: 8
Views: 1205

Re: Bridge Model with Truss and Beam-Column Elements OR End Moments Release

I think you should also fix out of plane DOF for 3-D truss elements.
For example if the pushover load is in x-y plane the for truss end nodes the fixity should be - fix(0,0,1,1,1,1) - arrest z movement
if the load is in x-z plane then fixity should be - fix(0,1,0,1,1,1) - arrest y movement
by Ashok
Sat Mar 06, 2021 1:33 am
Forum: OpenSeesPy
Topic: Kernel dead with node recorder
Replies: 3
Views: 792

Re: Kernel dead with node recorder

Sorry sir,
Problem solved. The "-" before the "-disp" caused the kernel to be dead. Now its working.
The correct command is:
ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'disp')
by Ashok
Fri Mar 05, 2021 10:27 pm
Forum: OpenSeesPy
Topic: Kernel dead with node recorder
Replies: 3
Views: 792

Re: Kernel dead with node recorder

Dear Prof.Scott, This is just the python version of the uniaxial material test https://opensees.berkeley.edu/OpenSees/manuals/usermanual/751.htm?fbclid=IwAR0cGjrGz2coyudp3v90Ly8Qz33HGd0cj02leHGnGl-ChB_Lf3Q8uvDfkvo The pattern cab be found in the same link (first line of the code). This is the code i...
by Ashok
Fri Mar 05, 2021 1:16 am
Forum: OpenSeesPy
Topic: Kernel dead with node recorder
Replies: 3
Views: 792

Kernel dead with node recorder

I am using node recorder as
"ops.recorder('Node','-file','disp.txt','-node',2,'-dof',1,'-disp')"
If I comment out this line code runs properly, but if I include this the message shows up - "kernel dead...."___"Restarting kernel"..

Did anyone face this issue..? Can you help me out..?
Thank you.
by Ashok
Tue Mar 02, 2021 9:21 pm
Forum: OpenSees.exe Users
Topic: large displacement large strain
Replies: 7
Views: 1291

Re: large displacement large strain

Can you include that effect in your material model ?
As far as my understanding goes with OpenSees - it is strong in material modelling. So when using OpenSees always think - can I convert this phenomenon into a material model..? At least I tend to think like that - personally.
by Ashok
Tue Mar 02, 2021 9:15 pm
Forum: OpenSees.exe Users
Topic: ShellMITC4 and zeroLength Element
Replies: 1
Views: 609

Re: ShellMITC4 and zeroLength Element

I think yes. You can give very small rotational stiffness...
by Ashok
Tue Mar 02, 2021 9:11 pm
Forum: OpenSees.exe Users
Topic: Composite Section Using Two Elements
Replies: 1
Views: 570

Re: Composite Section Using Two Elements

Instead of going for two elements - I think it's better to go for two materials in a same beam element cross section. This is possible using fiber section. https://opensees.berkeley.edu/wiki/index.php/OpenSees_Example_9._Build_%26_Analyze_a_Section_Example See this presentation for visualizing a com...
by Ashok
Mon Feb 15, 2021 1:17 am
Forum: OpenSees.exe Users
Topic: Step time dependent material
Replies: 5
Views: 998

Re: Step time dependent material

Dear Prof. Scott, One more question. After formulating the material and running the test analysis( https://opensees.berkeley.edu/OpenSees/manuals/usermanual/751.htm?fbclid=IwAR3TT7NnC8HvDKVz9Rkko-dOlB33o7VfJOGa9frFfmLwumeFpU8yPeZbHdU ) - I am getting a plot like shown in the figure. Everything is fi...
by Ashok
Fri Feb 12, 2021 9:57 pm
Forum: OpenSees.exe Users
Topic: Step time dependent material
Replies: 5
Views: 998

Re: Step time dependent material

Thanks a lot. It worked.