Shock Absorption Effect of Isolation Bearing on High-pier Large-span Continuous Rigid Bridges
Focusing on a high-pier large-span continuous rigid bridge of(120+220+120)m as the engineering background,to reduce the seismic response and enhance the seismic performance under the effect of strong earthquakes,this paper introduced the structures and mechanical properties of two commonly used isolation bearing types of lead-core rubber bearing(LRB)and ring wire rope composite damping bearing(GSQZ)and studied the effects of different isolation bearings on the seismic performance of the bridge by the nonlinear time history analysis.The results showed that these two isolation bearings had a significant shock absorption effect on the girder ends and the main pier,but little effect on the middle span.Installing isolation bearings would provide a better shock absorption effect on the transverse bridge internal force at the main pier and a limited effect on the longitudinal internal force at the main pier.The shock absorption effect of LRB was better than that of GSQZ,however,neither of them had a high shock absorption rate in rigid bridges,and the bearings should be used with dampers in the actual design.
high-pier large-span continuous rigid bridgeisolation bearingdynamic time history analysisseismic responseshock absorption effect
万方数据
维普
