Abstract
The ICSS (seismic Isolation Controlled Slide System) is a structural system for effective seismic design of multi-span continuous girder bridges based on the idea of an optimized combination of isolation bearings, seismic dampers and slide bearings. It is observed that ICSS tends to be sensitive to the input incident angle, partly due to the particular nature of the seismic dampers that act as energy dissipation device only in the axial direction. In order to achieve designated seismic performance a bridge with ICSS, it is of great importance to correctly evaluate the seismic response of the system under realistic ground motions. For this aim, seismic response assessment of a bridge with ICSS using bi-directional seismic ground motion inputs is performed. The bi-directional accelerograms are generated so that the bi-axial response spectrum is compatible to the design spectrum specified in the Japanese bridge design code. It is found that the rotational direction of the trajectory of the bi-directional acceleration input due to the inter-component phase difference, classified as 'clockwise input' or 'counter-clockwise input' directions, significantly influences the response of ICSS.
