SEISMIC ANALYSIS ON THE VIADUCT-SUBWAY STATION-PILE-SOIL COMPLEX STRUCTURE SYSTEM

Based on ANSYS, a whole complex junction structure system between an airport viaduct project and a subway station was mainly analyzed. The complex structure model considering viaduct-subway station-pile-soil interactions was established and calculated by using an earthquake response analysis process. Also the conventional rigid foundation method and the whole model without subway station were contrast analyzed. The analysis results show that: due to the influence of PSSI(Pile-Soil and Structure Interactions), the overall structure dynamic properties have clear differences with the conventional rigid foundation model, the system natural vibration period increases, and first few main vibration modes have great changes. The bridge maximum displacement is raised, but the displacement changes of the longitudinal and transverse direction have differences. To the acceleration of the maximum displacement node, the bearing and the pier reaction, the longitudinal differences are more apparent than the transverse ones. Comparing the conventional rigid foundation method model, the longitudinal direction changes reduce above three items, but increase in the transverse direction. Therefore, when the whole complex structure system is analyzed, the dynamic analysis of considering PSSI is very necessary.