ABSTRACT
The paper investigates the dynamic interaction between a metro station and a building with basement, prospecting the station, when subjected to seismic excitation in the transversal direction. A real case study of the under-construction metro in Thessaloniki, Greece is actually analyzed under plane strain conditions, employing ABAQUS, with the building being simulated in a simplified fashion as an equivalent single-degree-of-freedom oscillator. The results of the above analyses are compared with the predictions of additional analyses neglecting the building, so as to identify and quantify the effects of the dynamic interaction between the structures on the racking response of the station, as well as on seismic earth pressures and dynamic bending moments developed on the station diaphragm walls. The study indicates a general increase of the seismic response of the station due to the presence of the building. Additionally, a new racking ratio – flexibility ratio (R-F) relation is proposed to better describe the response of large metro stations, since the existing relations are found to be inadequate for this type of embedded structures.
