Characteristics of Uplift Force Acting on Bridge Bearings during Earthquakes

Abstract

This study aims to reveal the characteristics of and factors influencing uplift forces acting on bridge bearings during earthquakes. Firstly, three different analysis models were compared through seismic response analyses in order to select a suitable model for parametric analysis. Secondly, factors influencing the uplift force were investigated by examining the seismic response analyses of six different bridge models of normal Japanese steel railway bridges. Finally, a nonlinear hysteresis model of a bridge bearing was proposed and the influence of using this model was investigated. As a result, it was confirmed that the response displacement does not exceed the limit displacement even during large-scale earthquakes.