The seismic finite element models of the 32 m simply-supported railway bridge with the common pier and three different height piers were established,respectively,and the seismic performance of the bridge under ordinary bearing system and reduced-isolation bearing system was analyzed and compared.The results show that the common support system can't meet the performance requirement under the rare earthquake for the common simply-supported railway bridge.The hyperboloid spherical isolation bearings can significantly reduce the internal force at the bottom of pier.Based on the selected nonlinear calculation parameters,the damping ratio of the pier at the bottom for the bending moment amounts to more than 58％,and a better damping effect can be obtained with a shorter height of the pier.
关键词
高烈度震区/简支梁/抗震设防/减隔震支座/铁路桥梁/减隔震率
Key words
high intensity seismic region/simple-supported beam/seismic fortification/isolation bearing/railway bridge/damping ratio
维普
万方数据