General Mechanical

General Mechanical

Response sectra RSA

    • MJol
      Subscriber

      Hello,


      I try to use Response spectrum on a concrete structure, but I cannot choose the boundary condition. My structure has an invert and long strip footing (surface model).


      I created a static model, then a modal analysis and the RSA in CQC.


      Why I can not choose the boundary conditions? Why am I not able to select the invert and the footings?


      Moreover, how to manage the damping? There is 2 damping options? What is it refered to?


      Thank you for your answers.


      Best regards

    • MJol
      Subscriber

      It's because of the elastic supports I put in the model. If I do a RS modeling with fixed supports, it works.


       


       

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