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I used the Zero-Length Elements to modle a damper. BUT I found the acceleration in ends of damper ($iNode $jNode )was too large. so I the there may be something wrong with the damper which was modled by the Zero-Length Elements. And I do not thingk force-based beam-column element and Maxwell materia...

But I think force-based beam-column element and Maxwell material to model the damper is not appropriate for the length of damper is nearly to be 0 and the damper has not a section. Ineed to know is it right to use the the Zero-Length Elements to modle a damper like this: uniaxialMaterial Elastic 1 6...

I thingk I can use zhe frist two ways to model dampers(truss element and viscous material). I can use the viscous material to define the C= 3.24e5,BUT how can I define the K= 6.8098e6? I know K=EA/L, but the E(elastic modulus) has not be deifined. I think the stiffness can be defined by the Truss El...

if my program is wrong,please tell me how to modify it.

I want to use the Zero-Length Elements to modle a damper. K= 6.8098e6,
C= 3.24e5.But I do not know if my program is right,any one can help me?
uniaxialMaterial Elastic 1 6.8098e6;
uniaxialMaterial Viscous 2 3.24e5 1;
uniaxialMaterial Parallel 3 3 5;
element zeroLength 1 $iNode $jNode -mat 3 -dir 1;

Look at the hysteretic curve of the material, when the deformation increased, the stiffiness increased. I think this is very important and Bouc-Wen Material can not fit this.

Is there some other materials can fit this?

Thank you very much. The material is similar to rubber or concrete, the positive side of force-displacement relationship can be ignored. In fact, the file you saw has something wrong: it showed the negative side of force-displacement relationship not the positive side. Compressive load should be inp...

Thank you very much. The material is similar to rubber or concrete, the positive side of force-displacement relationship can be ignored. In fact, the file you saw has something wrong: it showed the negative side of force-displacement relationship not the positive side. Compressive load should be inp...

the file named "（å

Think you for your patience. The link is www.4shared.com/document/wsXbRrvu/1_online.html Open the file you download and you can see the hysteretic curve which can show the force and deformation relation of the material. The force in Y axis and deformation in the X axis. the file was editored by Micr...