Abstract:Under earthquake action, the pounding between adjacent main beams can change the dynamic response of an abutment-approach bridge-rigid frame continuous girder bridge system. To explore the influence of structural parameters (structural form of main bridge, pier height, span number of approach bridge, expansion joint spacing, etc.) on the pounding effect at expansion joints and seismic response of bridge structure, we considered an actual prototype bridge as a research object. We considered the dissipation of pounding energy, the interaction between pile and soil, and the interaction between abutment and backfill behind abutment and established the nonlinear behavior of bearing and pier, a finite-element model of the abutment-approach bridge-rigid frame continuous girder bridge structure system was established using CSiBridge, and elastic-plastic dynamic analysis was carried out. The analysis results reveal that the stress of the main pier varies with the different structural forms of the main bridge, and the stress of the continuous girder bridge becomes more reasonable when the height difference between adjacent main piers increases. With the increase in pier height, the dynamic difference between the main approach bridges increases, and the pounding effect becomes more significant. The increased number of spans of the approach bridge and the increase in the spacing between expansion joints cause the pounding effect at the expansion joints to increase and decrease, respectively. The enhancement and weakening of the pounding suppression effect also cause the decrease and increase in the internal force and deformation of rigid frame piers, respectively, but have a negligible effect on other piers.
