ANALYSIS OF SEISMIC INFLUENCING FACTORS OF DOUBLE COLUMN PIER SYSTEM BEAMS IN LARGE-SPAN CONTINUOUS RIGID FRAME BRIDGES
To investigate the seismic performance of large-span continuous rigid-frame bridges with twin piers and the influence of the pier-body-to-beam system on seismic resistance,considering the Qinglongjian Special Bridge spanning over the Longhai Railway in the context of the interchange project,finite element analysis models were established using Midas software for different configurations of the entire bridge.Response spectrum analysis and time history analysis were conducted under El and E2 seismic actions,along with pier ductility seismic analysis under the E2 seismic action.Results indicate that under El seismic action,the bridge did not enter the ductile phase,remaining entirely within the elastic range.The response of critical components met seismic requirements.Under E2 seismic action,plastic hinge regions appeared at the pier base,demonstrating sufficient displacement capacity at the pier top.For tall and slender piers,the introduction of transverse beams increased lateral stiffness and improved the bending moment distribution of the pier columns,contributing to seismic resistance.During the ductile seismic phase,adding transverse beams reduced pier top displacement,enhancing the stability of the bridge while meeting ductility requirements.
large-span continuous rigid frame bridgeseismic time history analysisductility seismic
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