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  1. DanCivil

    Modellation of TMD for a cable-stayed bridge (in SAP2000)

    at first I would suggest to check the mass source (Define - Define mass source). It is important that "additionall masses" are used. Afterwards it should be checked if there is any kind of displacment of the joint and the link element. Perhaps you could place the sdb-file here, this would...
  2. DanCivil

    Damping in Response Spectrum Analysis

    This issue has been clarified. The wiki-Page was also corrected. Note: The damping ratio has to be entered like this: 5% = 5.0 (and not 0.05)
  3. DanCivil

    Damping in Response Spectrum Analysis

    Dear Sirs, we want to know how the response-spectrum curve will automatically be adjusted from the function damping value to the actual damping present in the model. We just found an answer (see below), but our simplified calculations (S-DOF System) show a different behaviour. Please clarify...
  4. DanCivil

    FEMAP + NASTRAN - DAMPER CBUSH1D

    Thanks Thomas, but I need a nonlinear relationship depending on the velocity and not on the frequency. At the moment I think it is only possible to edit the bulk data as you guessed best regards, Daniel
  5. DanCivil

    FEMAP + NASTRAN - DAMPER CBUSH1D

    Dear Sirs, I want to define a damper (force - velocity relationship) in FEMAP. So far I found the description of a CBUSH1D Element in the NASTRAN manual. Unfortuntately I can not find any possibility in FEMAP to use this kind of element. What can I do ? FYI We are using "FEMAP WITH NASTRAN NX...
  6. DanCivil

    SPRING INSTEAD OF LINK-ELEMENT

    Thanks for your answer, but I do not think its a bug I think the "link - element" is not the right element I want to use. I want "pure" stiffness behaviour in the 3 directions without shear / moment transfer. regards, Dan
  7. DanCivil

    SPRING INSTEAD OF LINK-ELEMENT

    Dear Sirs, so far we us linear link elements to simulate a spring. The problem of the link element is that is also transfers shear forces / moments. E.g. I define a linear spring link element with stiffnesses in all three (x,y,z,) directions. If I conncect two joints (with different z...

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