SEISMIC MITIGATION EFFECT ANALYSIS ON FRICTION PENDULUM BEARINGAPPLIED IN THE UNDERGROUND SUBWAY STATION

Based on the failure mode and damage mechanism of the Daikai subway station during Kobe earthquake, this paper proposes a new seismic mitigation structure. The friction pendulum bearing is installed at the top of the central columns, using the seismic isolation and mitigation design concept of surface structures. The 2D finite element models of soil-structure are analyzed, and then the seismic response of the original and proposed structure in different slide way radius and friction coefficient are compared by dynamic time history analysis method. The comparison results show that the new structure with friction pendulum bearing is softer than the original structure, resulting in a larger relative horizontal deformation. The deformation, shear forces and moments of the central columns are significantly reduced, when the slide way radius is large and the friction coefficient is small.