Analysis of seismic ground response and soil-structure interaction on step-like topography due to rock-outcrop motions

This study presents the impact of step-like ground slopes on free-field motions at different excitation frequencies. Furthermore, numerical analyses were also performed to evaluate how variations in dynamic soil displacements due to kinematic interaction affect the seismic response of the building. To analyze the complex wave propagation mechanism within the scope of this study, 1-D and 2-D wave propagation models were developed using the geometry and the dynamic soil properties based on the literature. The 2-D finite element model of topographical irregularities was calibrated in terms of lateral acceleration behavior using both recorded values and previously computed data by researchers. The evaluation of seismic ground response includes the amplification effects on acceleration-time histories and the response spectra utilized in seismic codes. Additionally, the 2-D dynamic response of buildings with different periods was investigated considering the influence of topography-soil-structure interaction resulting from rock-outcrop motions. Results indicate significant role of particular factors in the variability of intense amplification.