The OpenSees Community

Hi Frank, Thanks again for your help. When developing an element with multiple DOF per node, does the ordering of the DOF have to follow a specific organization such as [d1x, d1y, d2x, d2y] (d is displacement) when building the mass, damping, and stiffness matrices? Or is it only important to be con...

Hi Frank, Thank you for your reply. In regards to the pressure boundary conditions, I'm considering axisymmetric elements (like for pressure vessels) where the internally and externally applied loads are in terms of pressures rather than forces. In these cases, the nodal forces are displacement depe...

Hi Frank, Just bumping this thread in case you missed it. I have your thesis and I have looked through the wiki and manual, but maybe I'm just not seeing these terms. Also, for elements that have pressure stiffness terms, how can we determine which elements are subjected to a pressure boundary condi...

Hi Frank, I'm interested in getting documentation on the methods and procedures for adding new elements in opensees. Could you explain the following functions: Element::getResistingForce(), Node::getTrialDisp(), Node::getIncrDisp()? I'm confused about whether getTrialDisp returns the displacement fr...

Hi Frank,

It's no problem. Thank you for getting the link repaired.

Thanks again,
Robbie

Hi Frank, Thanks for replying so quickly. I took a look around the forums and wiki and found that people had success with files in the tarball opensees.berkeley.edu/OpenSees/code/OpenSeesDeveloper.tar.gz . Unfortunately, the link is not working. If I want to create an element dll, can I get the nece...

Hi Frank, I'm having a similar issue with minPackage.lib when trying to compile the trussCPP dll example. I downloaded the stable source code this morning from the developer download link. I'm compiling on Windows Vista with Visual C++ Express 2008. 1>Linking... 1>LINK : fatal error LNK1181: cannot ...

Hi Frank,

Is it possible to add the recorder dynamic libraries to OpenSees?

Thanks,
Robbie

I'd like to see a standard set of tests that each element and/or constitutive model are put through for verification purposes. Each version of OpenSees.exe should run these tests and be compared against analytical solutions where applicable. The results should also be posted on the OpenSees website ...

Hi,

Depending on which type of material you have, you can do something like this:

strain_incr = input_strain - commit_strain which would be the strain increment from the last committed step.

Robbie

Hi Frank,

Is CUDA support going to be included into OpenSees?

Thanks,
Robbie

I think it means that you need to verify that the materials and elements behave as they should. You should run single element and multi-element tests against known analytical solutions to do this.

Hello, You can link your material using the dynamic linking api that Frank has released recently. He has provided a document detailing how to do this and it is available on this website. I believe this would be easier than trying to recompile the entire project with your material included. Hope that...

Hi,

It is pretty simple to do since Xcode supports building with makefiles. In Xcode, create a new project and choose the template 'External Build System'. After that, you will need to edit the build target so that Xcode knows which directory to call make from.

Robbie

This is not an easy decision to make. If you have experimental data, you should see which models give you the best fit at the material level before you work on the global scale.