The OpenSees Community

There is a bug in the way the elemental loads are taken into account for the construction of element's stiffness matrix. When calling getTangentStiff() the element's resisting forces in the natural system are calculated by q = kv + q0. Adding q0 to q leads to the negation of the elemental load, as i...

Hello Osees community, I have a question about the implementation of Modified Newton-Raphson algorithm (or equivalently Newton with -initial) in Osees. To be more specific in the method "int ModifiedNewton::solveCurrentStep(void)" the method theSOE->solve() is invoked which performs umfpac...

stefanocoluzzi wrote: > Hello, > > I have some problems with SVN dowloaded from github. > 1. '..\..\..\SRC\material\nD\stressDensityModel\StressDensityModel.cpp': No > such file or directory > 2. '..\..\..\SRC\material\nD\stressDensityModel\StressDensityModel2D.cpp': > No such file or directory > 3....

And thank you in return for writing all of these. I really appreciate your work

Hello SadeghSalimian, I found a different bug in the code. I guess it is proper to post it here: The geometric nonlinear stiffness matrix (for p-delta) is calculated wrong at so the results are not valid (I compared with SAP2000 and they are completely different). So, i recommend NOT to use timoshen...

Hello Osees community,
I detected some bugs in the Timoshenko 2d and 3d. Should i post the fix here or contact with someone?

Tsarpalis Dimitrios

selimgunay wrote: > When you say that you fail to get convergence, do you mean that the > analysis is completed for different meshes but the analysis results are > different? Yes exactly. The cantilever is parallel to the Y axis, has length 9.28 meters and i apply the following forces at the free en...

Hello Opensees community , I'm trying to model a simple 2D Timoshenko cantilever with nodal X and Y Forces at the free end and PDelta transformation. I have 4 models with different mesh each: 2 points, 8 points, 20 points and 40 points. The problem is that I fail to get a convergence, each model giv...