采用中层减隔震体系高墩桥梁纵桥向抗震性能分析  

Seismic Performances along the Span Direction for High Pier Bridges with a Middle-seismic-isolation Design

作　　者：李晓琴[1] 

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《结构工程师》2014年第2期79-83,共5页Structural Engineers

基　　金：国家自然科学基金资助项目(90915011;51278376)

摘　　要：传统的桥梁抗震设计方法分为延性抗震设计和减隔震设计两类。对于高墩桥梁来说,通常采用延性抗震方法作为首选方案,而震后易修复的减隔震方案对高墩桥梁较难应用。提出一种新型高墩中层减隔震体系,即将一般高墩桥梁的桥墩在中部隔断,在隔断处设置减隔震支座,以某高架桥为背景,对比了延性设计、传统减隔震设计与中层减隔震设计的纵桥向抗震效果。研究表明,从"力"与"位移"两方面来看,相较于延性设计和传统减隔震设计,高墩桥梁采用中层减隔震设计的抗震效果更为明显,可以提高高墩桥梁采用减隔震技术的适应性。Ductility seismic design and seismic isolation design are two major seismic design methods for bridges. In the seismic design of high pier bridges, the ductility seismic design is a preferred method, since the seismic isolation design is difficult to apply although it is easy to repair after earthquakes. In this paper, a new seismic design method called the middle-seismic-isolation design is presented, in which seismic isolation bearings are deployed in the middle of high piers. Seismic performances of bridges by using the ductility seis- mic design, the seismic isolation design, and the middle-seismic-isolation design are compared with a practical viaduct project. The results indicate that the seismic performance of the bridge with the middle-seismic-isola- tion design, in terms of force and displacement, is significantly better. By this approach, the seismic isolation design could be applied to a broader range of bridges with high piers.

关 键 词：中层减隔震设计 延性设计 传统减隔震设计 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]