modelling of contact in harmonic response

[marioooo16]

Hi,

I'm modelling a bar in concrete with applyed force on the bar. When I model them seperately, I get response which is OK, that is - when the steel bar is modeled alone the output spectar (frequency-amplitude) looks OK, and when I model only concrete block its response is also OK. However, when I try to model them together nad apply force on bar, the response I get is the one which corresponds to bar. It doesn't 'recognize' concrete. If I use any contac (no separation, bonded, etc.) i always have the same resonse - response of bar to applyed force. Does anybody have experience with modelling of contact?

Best regards!

 

[FEAdesserve]

I presume that you must be doing a mode superposition analysis. Modal Analysis doesn't support any non linear contacts and hence you will see them as same. The correct method will be to model the Concrete by applying damping and to model the bars as link elements. You can also try doing a full harmonic analysis.

Regards,
Raj
Desserve Engineering