Artificial Seismic Motion Simulation and Response Spectrum Fitting Considering Amplitude Spectrum and Phase Spectrum

Artificial seismic motion simulation and response spectrum fitting considering amplitude and phase spectra constitute an important research direction in earthquake engineering. China has revised the "Code for Seismic Design of Building Structures," extending the design response spectrum period from 3 seconds to 6 seconds to better adapt to complex seismic environments. This extension significantly impacts seismic motion simulation and acceleration response spectrum fitting. Consequently, this program utilizes the new standard response spectrum as the target spectrum and employs trigonometric series superposition method to simulate seismic acceleration motions, implementing Fourier-based synthesis with controlled phase characteristics to better capture the complexity and uncertainty of seismic motions. The algorithm iteratively adjusts both amplitude and phase components to achieve spectrum compatibility. Through this program's research, we can better understand the characteristics and patterns of seismic motions, providing more accurate reference basis for earthquake engineering design and practice.