Compressive strength of concrete

[aeng96]

Why in the IDA analysis, when I increase the compressive strength of concrete, I don't see any effect on the seismic behavior of the structure?
For example, I want to check the difference in the seismic behavior of the structure between the compressive strength of 30 MPa and 80 MPa. For the compressive strength of 30 MPa, concrete type of con_ma is used, and for the compressive strength of 80 MPa, concrete type of con_hs is used.