Isolation Bridge Numerical Simulation And Shaking Table Test Research

Recently，Seismic isolation technology is gradually used in bridge engineering.This method can effectively prevent and dissipate the input energy of earthquake andreduce the acceleration response of structures. At present, the main isolation bearingsfor bridge are lead rubber bearings, high damping rubber bearings and frictionpendulum bearings. There have been many Researches about isolation effect anddynamic characteristic of lead rubber bearings, high damping rubber bearings andfriction pendulum bearings, but few works about comparative studies of these threetypes bearings. Seismic isolation technology has been widely applied for straightbridges, but few for cured bridges. Researches on the isolation effect of Isolatedbridge set with different isolation bearings and the dynamic characteristic of bridgewith seismic isolation technology is less. In order to solve the problems above, thefollowing contents have studied:1．The shaking table test of isolated bridge was studied. The parameters of leadrubber bearings are designed for the three-span continuous bridge. The shaking tabletest bridge model is design and built according to the model test similarity principle.Then, Input earthquakes including Capemendrio wave, El Centro wave andNORTHRIDGE wave are selected to perform the shaking table test. Meanwhile,establish the infinite element analytical model to simulate the test. The comparisonbetween test result and analysis result is performed. The test research shows that theacceleration of bridge deck is less than that of the table and yielding bearings showthe good dissipation energy ability under the design and rare earthquake. Besides, thetest verifies the test design and FEM.2. The isolation effect of bridge set with different isolation bearings was studied.This paper summarizes the equivalent linear and non-linear models of lead rubberbearings, high damping rubber bearings and friction pendulum bearings. Theparameters of isolation bearings are designed in the same condition. Using thenon-linear time-history analysis method, earthquake response analyses of the bridgeare performed. The analyses show that the deformation of high damping rubberbearings is less than that of others, while the column-bottom shear force and bendingmoment of three types Isolated bridge are the same. Besides, all of them have theproximate isolation effects. 3. The dynamic characteristic of curved isolation bridge was studied. Curvedbridge is the important bridge style of modern transportation engineering. It is theimportant method to realize the connection of each direction. Cured brides have thecomplex stress because the torsion coupled with moment. In this paper, seismicisolation technology is used in curved bridge. Using the non-linear time historyanalysis method, earthquake response analyses of the bridges with different curvatureare performed. The research shows that each curved isolated bridge has good isolationeffect, and application of seismic isolation technology readjusts earthquake-resistforce of the columns of curved bridges. Besides, different curvature bridge hasdifferent earthquake response.