fig22

Figure 22. Analysis results of frequency domain and time domain under different discrete-time steps of structure-circular foundation. (A) Δt = 0.005 s: (A-a) Parameter fitting result of circular foundation; (A-b) Time history result of circular foundation; (A-c) Infinite soil domain frequency domain characteristic; (A-d) Soil-structure interaction system frequency domain characteristic; (B) Δt = 0.01 s: (B-a) Parameter fitting result of circular foundation; (B-b) Time history result of circular foundation; (B-c) Infinite soil domain frequency domain characteristic; (B-d) Soil-structure interaction system frequency domain characteristic; (C) Δt = 0.02 s: (C-a) Parameter fitting result of circular foundation; (C-b) Time history result of circular foundation; (C-c) Infinite soil domain frequency domain characteristic; (C-d) Soil-structure interaction system frequency domain characteristic.