Shaking table tests on a transportation hub combining underground stations and aboveground structures
Shaking table tests on a transportation hub combining underground stations and aboveground structures
With the continuous advancement of the station-city integration concept, integrated air-rail transportation hubs have emerged as a major innovation in urban transportation infrastructure. This paper investigates the seismic performance of a transportation hub that combines underground stations and aboveground structures through 1g shaking table tests. Based on the dynamic equilibrium equations, similitude relations for shaking table testing were derived. A displacement scaling factor different from the geometry scaling factor was adopted, with particular emphasis on the dynamic response characteristics of the structure within the elastic range. The experimental results reveal pronounced spatial variability in the seismic response of the integrated hub. Under seismic excitation, the dynamic vibration of the aboveground structures leads to amplified acceleration responses in the corresponding underground components compared with those in the purely underground segment. A similar amplification trend is observed in the inter-story relative displacement, with the peak value in the terminal segment reaching up to 3.1 times that of the station-only segment. However, this amplification effect diminishes with increasing burial depth. At the base slab elevation, the spectral response of the underground station in all segments closely matches that of the surrounding soil, indicating that the dynamic behavior is predominantly controlled by site effects. These findings highlight that spatial variability should be adequately considered in the seismic design of integrated transportation hubs.
Zhihan Zhang; Xian Liu; Chuanping Liu; Xupeng Yao; Yong Yuan
11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)
Session 3: Resilient geotechnical infrastructure
https://doi.org/10.53243/ICPMG2026-128