Research on Effect of Side-Pier Restraint on Transverse Seismicity of Cable-Stayed Bridge with a Pylon-Girder-Pier Fixity System
This study investigates the transverse seismic performance of the cable-stayed bridge with a pylon-girder-pier fixity system and the selection of rational seismic mitigation system.The Shuaixiang Bridge in Hunan Province with a main span of 305 m is used as a case.Eight different types of side-pier restraint schemes were modelled in MIDAS Civil,including seven conventional bearing restraints and one friction pendulum spherical bearing restraint,to analyze the effects of different types of side-pier restraints on the transverse bending moments in pylon bottom and transverse displacements at main girder ends in the cable-stayed bridge with a pylon-girder-pier fixity system.It is shown that compared with the conventional side-pier restraints,the friction pendulum spherical bearing restraint can not only mitigate the pylon-bottom transverse bending moments of the pylon-girder-pier fixity system during a seismic event,but also control the girder-end transverse displacement within relatively smaller ranges,significantly improving the transverse seismic performance of the cable-stayed bridge with a pylon-girder-pier fixity system.Under E2 earthquakes,the structural responses are smaller than static calculation.The main piers,pylons and side piers are all at elastic stages,indicating that the seismicity does not control the design.The friction pendulum spherical bearings were finally selected as the side-pier restraint scheme.
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