Study on Seismic Response Characteristics of Different Irregular Topographies under Seismic Excitation

This study employs the finite element method, combined with viscoelastic artificial boundary conditions, to systematically investigate the dynamic response characteristics and seismic wave propagation patterns of four typical irregular topographies (flat, slope, step, valley) under real seismic excitation. By inputting actual seismic records, the influence of different topographies on the amplification effect and spatial distribution characteristics of seismic waves was analyzed. The results indicate that topographic morphology plays a significant controlling role in the surface seismic response. Valley and step topographies are prone to inducing more pronounced displacement amplification phenomena, with amplification zones exhibiting non-uniform distribution. The adopted viscoelastic artificial boundary effectively suppressed boundary reflection effects, ensuring the accuracy of wave propagation simulation. The research findings provide a theoretical basis and data support for site-specific seismic response analysis and seismic design under complex topographic conditions, offering important reference value for engineering seismic practice.