The OpenSees Community

Hi OpenSees Community.

I've built a model which rapresent a wind turbine tower with beneath a shallow conical foundation. The tower is modelled with Timoshenko beams (about 15 elements for 5meters lenght) and the foundation with SSPbrick elements. The software has properly written the equal dof condition between the end node of the beam element in contact with the foundation and the node of the solid element of the latter.
Applying a vertical load the analysis works and converges but in the interval after applying a lateral load at the top of the tower the analysis does not converge, does not crash but the test does not go under tollerance and gives really high delta.

What is the problem according to you? Should I have to introduce some other conditions for a lateral loading analysis?

I'd be really grateful for your help!

P.S.: I've discovered that the tcl version is not the problem.

If I'll be able to figure out the issue, I'll tell all the community what I've done!

Warm Regard OpenSees People

Hi OpenSees community!
I've created a new build of the OpenSees.exe just few days ago. I've used both VS19 and VS22 just to compare the resulting .exe.
Well, the problem is that when I run my new .exe (that works) is much slower than the official one. Infact checking the usage of CPU I can see clearly the difference between the two.
I've used both the VS19 and 22 to see if could improve but nothing. I've noticed that the new release I've made when I ask:
"info patchlevel" it has 8.6.13 of tcl;
instead of 8.6.10 as the original one has.
Could be this the problem?
In VS I've created a Release version with all the Optimization settings to the velocity, therefore I'd not suppose that is this the problem.

Could you help me please?

My warm regards!

Hi OpenSees Community. It's my first post here

I am running the following Gravity analysis with the SANISAND04 costitutive law.
The analysis has the following parameters:

system BandGeneral
numberer RCM
constraints Transformation
integrator LoadControl 0.25
test NormDispIncr 1e-06 100 0
algorithm Newton
analysis Static

updateMaterialStage -material 366 -stage 1

analyze 4



But when I run it I've got the following message:

WARNING: CTestNormDispIncr::test() - failed to converge
after: 100 iterations current Norm: 5.31012e-05 (max: 1e-06, Norm deltaR: 1.16921)
NewtonRaphson::solveCurrentStep() -the ConvergenceTest object failed in test()
StaticAnalysis::analyze() - the Algorithm failed at step: 0 with domain at load factor 0.25
OpenSees > analyze failed, returned: -3 error flag

The model is working cause I've tried to run it before with an Elastic costitutive law and it works!
How can I improve it to make it better?
Any ideas or raccomendations?
For example I did not use any substepping, could be useful?

Thank you very much!