Hi
Follow this guide to model RC structure - of course since it is random vibration you can only use linear material so Young's modulus, Poisson's ratio and density only (so do not follow the steps with nonlinear material in this guide just use only the above mentioned properties).
https://forum.ansys.com/forums/topic/how-can-we-model-failure-in-reinforced-concrete-rc-slabs/
All the best
Erik
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