Search found 8 matches

by TsarpalisD
Thu Oct 10, 2019 1:25 am
Forum: Framework
Topic: Bug in elemental loads
Replies: 0
Views: 982

Bug in elemental loads

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...
by TsarpalisD
Wed Feb 27, 2019 3:01 am
Forum: Framework
Topic: Question about Modified Newton-Raphson and UMFpack solver
Replies: 0
Views: 584

Question about Modified Newton-Raphson and UMFpack solver

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 umfpack_di_numer...
by TsarpalisD
Mon Nov 05, 2018 5:29 am
Forum: Framework
Topic: SVN Problem
Replies: 13
Views: 4745

Re: SVN Problem

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....
by TsarpalisD
Mon Mar 26, 2018 1:58 pm
Forum: Framework
Topic: Fixed some bugs on Timoshenko Element
Replies: 6
Views: 2584

Re: Fixed some bugs on Timoshenko Element

And thank you in return for writing all of these. I really appreciate your work :)
by TsarpalisD
Tue Mar 06, 2018 3:35 am
Forum: Framework
Topic: Fixed some bugs on Timoshenko Element
Replies: 6
Views: 2584

Re: Fixed some bugs on Timoshenko Element

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...
by TsarpalisD
Mon Feb 26, 2018 4:34 am
Forum: Framework
Topic: Fixed some bugs on Timoshenko Element
Replies: 6
Views: 2584

Fixed some bugs on Timoshenko Element

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
by TsarpalisD
Wed Jan 31, 2018 1:37 am
Forum: OpenSees.exe Users
Topic: Timoshenko beam issues
Replies: 2
Views: 1251

Re: Timoshenko beam issues

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...
by TsarpalisD
Sun Jan 28, 2018 11:25 am
Forum: OpenSees.exe Users
Topic: Timoshenko beam issues
Replies: 2
Views: 1251

Timoshenko beam issues

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...