Research on the Mode of Longitudinal Unseating Prevention System for Continuous-Beam Bridge

Abstract:

Seismic unseating prevention mearsures are often needed at expansion joints of bridges to prevent the superstructures from falling off during earthquakes. Domestic unseating prevention system without design is done by construction measures, so it can’t ascertain the effect of unseating prevention system. Overseas researching focused on simple-supported beam and ‘T’ frame with intermediary hinge. To mode of unseat-prevention, connection device between girders is applied by Japan,however, bridges in America usually adopts the restrainers between girder and pier. In this paper, two modes of unseating prevention system for the continuous-girder bridges is studied and result is: it is rational to mode of restrainers between girder and pier for the continuous-girder bridges.