Study on Parametric of Moving Amount of Unseating Prevention Devices for Highway Bridges

Abstract

Taking a three-span continuous bridge as the research object, the nonlinear time history analysis method is adopted. The influence of the moving amount of the unseating prevention devices on the seismic performance of the bridge under different fortification intensity was studied, and the reasonable value of the moving amount of the unseating prevention devices was discussed. Research shows that, in the starting range of the unseating prevention devices, the smaller the moving volume of the unseating prevention devices, the higher the fortification intensity, the decrease amplitude in the relative displacement of the pier beam, the internal force of the unseating prevention devices and the ratio of bending moment at bottom of side piers to middle piers are all greater. The higher the fortification intensity of the bridge site, the value of the reasonable movement of the unseating prevention devices will have greater. When the acceleration peaks are 220cm/s2, 400cm/s2 and 620cm/s2, the reasonable value of the moving amount can respectively be 9cm, 11cm, and 15cm.