减隔震支座在城市高架桥抗震设计中的应用

Application of Seismic Isolation Bearing in Aseismic Design of Urban Overpass

随着社会对地震认识的发展,抗震设计在桥梁设计中的比重显著提高,桥梁抗震性能影响到桥梁的使用寿命,而减隔震橡胶支座的使用能很好地改善这一性能。本文通过某城市高架桥的抗震设计,利用空间有限元程序MIDAS/civil建立桥梁结构的三维抗震模型,详细介绍了城市高架桥抗震设计的流程和减隔震支座的选用规则,通过两种类型的减隔震支座的对比分析,提出了不同类型减隔震支座的适用范围,为同类型桥梁的抗震设计提供参考依据。

With the development of earthquake knowledge,the proportion of aseismic design in bridge design has been significantly increased.The aseismic performance of bridges affects the service life of bridges.The use of rubber bearings can improve this performance very well.In this article,through the seismic design of a city overpass,the three-dimensional seismic model of the bridge structure is established by using the spatial finite element program MIDAS/civil.The process of seismic design and the selection rules of isolation bearings are introduced in detail,and the different types of isolation bearings are proposed through the comparison and analysis of two types of isolation bearings.The application scope of the support provides reference for aseismic design of the same type of bridge.