Research on Seismic Performance of Long Span Wide-Width Continuous Steel Box Girder Bridge by Using Friction Pendulum Bearing
To study the seismic isolation of friction pendulum bearings on long span and wide width con-tinuous beam bridges,a wide-width continuous steel box girder bridge with span arrangement of(40+2 x 60+45)m is taken as an example.The three-dimensional finite element model is established,which con-siders the interaction between piles and soil and the influence of adjacent spans.Nonlinear time history a-nalysis method is used to compare the dynamic response of bridges with conventional bearings and friction pendulum bearings under E2 level seismic motion.The results show that the most unfavorable internal force response of the bridge substructure is significantly reduced after the installation of friction pendulum bearings,and the seismic performance significantly improves.Compared with the conventional bearing schemes,the friction pendulum bearing scheme has a relatively large displacement at the beam ends under strong earthquakes.Therefore,sufficient deformation space should be left.Also limit devices should be used together with friction pendulum bearing.
steel box girder bridgefriction pendulum bearingseismic isolation designnonlinear time history analysis
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