速度锁定型减隔震支座设计与性能分析

Design and Performance Analysis for Bridge Bearing of Velocity-locked and Seismic Isolation

在长联大跨连续梁桥抗震设计中存在固定墩受力大和尺寸设计困难的问题。本文以成都—昆明铁路成都至峨眉段扩能改造工程中新青衣江特大桥的抗震问题为例,研究速度锁定型减隔震支座的设计方法与减隔震性能。抗震计算显示在小震时将桥梁活动墩变为固定墩能有效降低固定墩地震力,且大震时各墩均能起到减隔震作用,减隔震效果显著。通过抗震计算获得支座减隔震性能参数,完成支座样品的制造,进而开展减隔震性能试验。结果表明支座各项性能符合设计要求。

The problems of large force and diff icult size design of fixed piers exist in the aseismic design of long span and long unit continuous girder bridges. Taking the seismic problem of the N ew Qingyijiang bridge in the capacity expansion and transformation project from C hengdu to Emei of C hengdu-Kunming railway as an example,the design method and seismic isolation performance of the velocity-locked seismic isolation bearing were studied. The seismic calculation shows that the active pier of the bridge is transformed into fixed pier under small earthquakes to effectively reduce the seismic force of fixed pier,and all piers play the role of seismic isolation under large earthquakes,the effect of seismic isolation is remarkable.The parameters of bearing seismic isolation performance are obtained by seismic calculation. The sample of bearing is manufactured,and then the performance test of bearing seismic isolation is carried out. The test results show that the performance of the bearing meets the design requirements.