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Dear Vesna, I can't imagine how silly I am right now but can you please make me an example rather than 45 degrees?

Dear Vesna, How should the orientation define in my case? can I have an example?

Hi dear Vesna and dear all. Is ViscousDamper uniaxialMaterial different from defining Viscous uniaxialMaterial and stiffness material in series (Maxwell model)? If there is difference, what are they? (I believe there is, because the results are not the same) Which is preferred to use? Consider this ...

I want to model some kind of semi-active control using viscous damper. for this purpose I used this piece of code: [code] constraints Plain numberer RCM system SparseGeneral -piv test NormDispIncr 1.0e-8 10 algorithm ModifiedNewton integrator Newmark 0.5 0.25 analysis Transient for {set i 1} {$i<[ex...

I want to model a brace like viscous damper and As i read other posts it is said that best materials to model this kind is to use truss or zerolength element. I have couple of question about this: 1-I want to model viscous damper with K=1.9e6 (N/m) and Cd=4.0e5 (N.s/m) and alpha=0.6 . I used both tr...

Dear Vesna, As I mentioned above I download the latest version and try again and still i get this error ViscousDamper Model by S. Akcelyan and D.G. Lignos, McGill University WARNING - ForceBeamColumn2d::update - failed to get compatible element forces & deformations for element: 5(dW: << 1.#QNAN) WA...

I want to model viscous damper and according to OpenSees wiki i use this material uniaxialMaterial ViscousDamper $matTag $K $Cd $alpha but when I attempted to run my code, I got this warning: WARNING could not create uniaxialMaterial ViscousDamper while executing "uniaxialMaterial ViscousDamper $Vis...

I am wondering what are the differences between nonlinearBeamColumn, forceBeamColumn and dispBeamColumn elements and their usages?
Thanks

Recently I asked how to model Viscous Damping and I had been directed to this example: [url]http://opensees.berkeley.edu/wiki/index.php/Calibration_of_Maxwell_Material/[/url] I read the explanation of this example and in this example it is discussed that element "forceBeamColumn" should be used for ...

I want to use viscous dampers in my model but i do not know how to model them (what material and how to model damping).
I will be glad if you help me.

Is there any example for usage of active and semi-active dampers in structures? If not, here is my problem. I have moment resisting frame structure and I have a damper and an earthquake record with 40 second duration. I want this damper to damp seismic energy and force from duration 5 to 15 s, and o...

Is there any example for usage of active and semi-active dampers in structures? If not, here is my problem. I have moment resisting frame structure and I have a damper and an earthquake record with 40 second duration. I want this damper to damp seismic energy and force from duration 5 to 15 s, and o...

Dear Frank, my frame designed only for gravitational load and is weak and i pushed it to 1 meter. Can you help me with this please? Here is the capacity curve: http://cdn.imghack.se/images/9ad4ac07b81edeb5ec8fd28992114483.jpg (And the first code, above is the OpenSees code for it.) when I change the...

Hi, I want to do pushover analysis for a simple one storey and one bay frame. I define material with steel01 material and when the analysis done, I couldn't find any descending branch in pushover capacity curve and it is ascending. Is it because the definition of material? Will the problem be solved...

Dear Arshian
Can you please explain more about corotational geomtransf? so if it is better to use p-delta what is the purpose of using corotational?!