Seismic response characteristics of cross interchange metro stations: Transversal response of the three-storey section

Abstract

This paper presents an experimental study and a numerical parametric study, aiming to derive insights about the seismic response characteristics of typical cross interchange stations in soft soil and the critical parameters influencing the above response. The input motion condition, the soil-station interface properties, inertia of the structure, and the soil-station relative stiffness are the factors addressed in the parametric study. The study summarizes the key findings, focusing on the deformed pattern, the storey drift ratios, the earth pressure, and soil shear stress around the structures. The numerical analysis indicates combined racking-rocking deformation patterns for the cross interchange station, while the racking deformation is more-or-less evenly distributed among the three storeys away from the conjunction but highly concentrated on the bottom storey close to it. The soil yielding, the soil-structure interface characteristics, and the soil-structure relative stiffness significantly affected the storey-drifts, the soil dynamic earth pressure, and the soil shear stress developed around the structure during shaking. A series of numerical R′-F′ relations of the interchange station is concluded and compared to the R-F relation of a single station, along with the existing literature. The presented results lead to a better understanding of the dynamic response of typical two-storey to three-storey cross interchange stations in soft soil.