Seismic response analysis of a viaduct ramp bridge with partial vibration isolation
ZHANG Juhui1,LIANG Lei1,GUAN Zhongguo2
1.College of Environment and Arthitecture,University of Shanghai for Science and Technology,Shanghai 200093,China;
2.State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China
A partial vibration isolation system in which only short bridge columns are isolated was proposed for the a seismic design of ramp bridges.A parallel ramp bridge on the Jia-min Elevated Route in Shanghai was taken as a study object,and the structural seismic responses under three kinds of seismic resistant systems including a full ductility resistant system,a full vibration isolation system,and a partial vibration isolation system were analyzed.It was shown that compared with the full ductility resistant system,using the partial vibration isolation system in which the traditional fixed pier is changed into a movable pier,the earthquake intensity and deformation demand of the fixed pier along the longitudinal direction are effectively reduced by nearly 70%,the deformation demands of expansion joints at transition piers are reduced by almost 21%-34% ,and the acceleration of girders under the transverse earthquake input is also greatly reduced by 20%-39%; compared with the full vibration isolation system,simulation results for the 2nd design and the 3rd one are very close in aspects,such as,internal forces at pier bottom,bearing deformation and longitudinal displacements of expansion joints at transition piers; furthermore,two kinds of partial vibration isolation schemes with and without the arrangement of the fixed pier are compared,the latter has more superior performances,the latter can reduce the longitudinal seismic response of the fixed pier and the longitudinal acceleration of the main girders 56% and 38%,respectively.
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