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I want to define a damper, a friction damper. I think the Zero-Length Element can be used. BUT I do not know which uniaxial can be used to define the envelope. enve worse, I can not copy the picture which can show the envelope to here. My English is very poor , I think it may caused some troubles fo...

I want to use the Zero-Length Element to define a damping element,
BUT I do not know which uniaxialMaterial can be used to define damping .
anyone can help me?

Thank you very much. BUT I used the Concrete04 instead of Concrete02 to define the concrete and it worked. Can you tell me is it suitable for I useing the Concrete02 to define the uniaxialMaterial under the eatherquake action?

When I run my program, I got some errors and I do not know where the error is.I have got the period of the modle.anyone can help me? WARNING: CTestNormDispIncr::test() - failed to converge after: 10 iterations NewtnRaphson::solveCurrentStep() -the ConvergenceTest object failed in test() DirectIntegr...

I want to add a new element to the opensees, and I use the Visual Studio 2008 Professional Edition to compile opensees 2.20.when I press CTRL+F7,the VS2008 showed no warning or errors and I think it may be succesful:

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Thank youvery much!!!

My modle has only an elasticBeamColumn element and a zeroLengthContact3D element .when I run the program,I got the error like this: WARNING analysis Transient - no Algorithm yet specified, NewtonRaphson default will be used WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 1 WARNING N...

thank you very much!!!

thank you very much four your reply. I have sloved the problem.

I need to ask for the eigenvalues of a modle with a beam and two Bearings .But opensees give some warnings: WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 1 WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 1 WARNING BandGenLinLapackSolver::solve() -LAPACK routine re...

I need to ask for "eigen 1" of my model.However,the opensees give me a warning:
WARNING BandGenLinLapackSolver::solve() -LAPACK routine returned 7

I think there may be something wrong with my code ,I[b] want to know what cause the warning? Anyone can help me?[/b]