Abstract
During an earthquake, the nonlinearity of the bridge structure mainly occurs at the supports, bridge piers and restrainers. When entering nonlinear stage, members of the bridge structure affect the elasto-plastic seismic response of the whole structure to a certain extent; for multi-span continuous bridges, longitudinal restrainers can be installed on the movable piers to optimise the distribution of seismic force and enable the movable piers to bear a certain amount of seismic effect. In order to evaluate the effect of nonlinearity of restrainer and supports on the elasto-plastic seismic response of continuous girder bridge, analytical models of continuous girder bridge structure considering the nonlinearity of movable supports, restrainers and bridge piers were built and the nonlinear time history analysis was conducted to evaluate the effect of nonlinearity of restraining devices and supports on the elasto-plastic seismic response of continuous girder bridge. Relevant structural measures and recommendation were made to reduce the seismic response of the fixed piers of the continuous girder bridge.
Highlights
The investigations of previous seismic hazards showed that the damage of the bridge piers were not significant if failure occurred at the support, which suggests that the response of supports and bridge pier is interrelated; caging devices play a certain role in distributing the seismic force to each piers and abutments
The effect of nonlinearity of supports and restraining devices on the elasto-plastic seismic response of continuous girder bridge is evaluated in this study
Finite element models considering the elasto-plasticity of supports, restraining devices and bridge piers are proposed
Summary
The investigations of previous seismic hazards showed that the damage of the bridge piers were not significant if failure occurred at the support, which suggests that the response of supports and bridge pier is interrelated; caging devices play a certain role in distributing the seismic force to each piers and abutments. Xie xu [4] stated that horizontal seismic force produced by the superstructure of the continuous bridge is good to be carried by all piers and abutments to prevent overbearing of the fixed piers Relevant engineering procedures such as restraining devices were proposed. On the basis of considering the nonlinearity of supports, piers and restraining devices, the effect of restraining devices and nonlinearity of supports on the elasto-plastic seismic response of continuous girder bridge is evaluated and structural procedures to reduce the seismic response of the fixed piers of continuous girder bridge are proposed
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