某装配式小箱梁桥减隔震与延性抗震设计比较  

Comparison of Seismic Isolation and Seismic Ductility Design of a Fabricated Small Box Girder Bridge

作　　者：茹毅[1] 于西尧[1] Ru Yi;Yu Xiyao

机构地区：[1]天津市市政工程设计研究院

出　　处：《城市道桥与防洪》2019年第11期61-63,m0009,共4页Urban Roads Bridges & Flood Control

摘　　要：探讨了桥梁抗震设计的两种设计思路:延性设计和减隔震设计。以某高速上3×20m装配式小箱梁桥为工程背景,建立有限元模型,分别采用延性抗震体系和减隔震抗震体系进行抗震设计。基于具体的抗震设计,比较两种方法的设计特点、震后恢复方法和工程造价。结果表明,采用高阻尼支座的减隔震体系能够节省钢筋用量,节约工程造价,减小震后恢复难度,但桥梁的抗震能力取决于减隔震支座性能,采用减隔震体系设计的桥梁应重视减隔震支座的可靠性。This paper discusses two kinds of bridge aseismic design ideas,ductility design and seismic isolation design.Taking a 3 × 20 m fabricated small box girder bridge of expressway as an engineering background,a finite element model is established,and the seismic ductility system and the seismic isolation system are respectively used for the seismic design.Based on the specific seismic design,the design characteristics,post-earthquake recovery methods and engineering costs of two methods are compared.The results show that the seismic isolation system with high clamping bearing can save the amount of steel bars,save the engineering cost and reduce the difficulty of post-earthquake recovery.However,the aseismic capability of bridge depends on the performance of isolation bearing.The reliability of seismic isolation bearing should be paid attention in the design of bridge with seismic isolation system.

关 键 词：小箱梁 延性抗震 减隔震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]