Abstract
The verification of vertical response of bridge girders is important especially for the bridges with sliding isolation bearings, because the friction damping is not expected during the girder lifts up from the sliding bearing. This paper aims at evaluating the performance of the sliding type seismic isolation system for the vertical response of the bridges through the experiments and the numerical simulations. When the bridge girder lifts from the bearing due to the vertical response during an earthquake, the horizontal load distribution device undergoes tension force in the vertical direction, and the sliding plate undergoes impact force from the falling girder after floating. The test results and the numerical simulations show that the device holds the function as a seismic isolator even after the vertical movement of the girder.
