（1 上海科进咨询有限公司， 上海 200052； 2 同济大学结构工程与防灾研究所， 上海 200092）

［摘要］主要介绍了某大跨连续钢结构桁架商业廊桥的隔震分析与设计，考虑到工程具体情况，设置了铅芯橡胶支座，合理确定了铅芯橡胶支座的尺寸和设计参数，并采用MIDAS Gen软件对结构进行了多遇地震和罕遇地震作用下的线性与边界非线性时程分析及隔震设计。结果表明，设置合适的铅芯橡胶支座能够使得该连续钢结构桁架廊桥工程达到较好的隔震效果，对类似的工程有借鉴意义。

［关键词］钢结构桁架廊桥； 隔震分析； 铅芯橡胶支座； 边界非线性时程分析

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2018)09-0014-05

Seismic isolation analysis and design of a long-span continuous steel truss bridge

Lu Wenzhong1,2

(1 WSP Group, Shanghai 200052, China; 2 Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China)

Abstract:The seismic isolation analysis and design of a long-span continuous steel truss commercial bridge were introduced. Taking into account the specific circumstances of the project, lead rubber bearings were adopted and   the  size and design parameters of lead rubber bearings were determinated reasonably. MIDAS Gen software was used to conduct the linear and nonlinear boundary time-history analyses for the seismic isolation design under frequent earthquake and rare earthquake. The results show that the appropriate arrangement of lead rubber bearings can enable the continuous steel truss bridge project to achieve the good isolation effect and  it will also provide a good reference for similar projects.

Keywords:steel truss bridge; seismic isolation analysis; lead rubber bearing; boundary nonlinear time history analysis

作者简介：陆文忠，工程师，一级注册结构工程师，注册土木工程师（岩土），Email：Luwenzhong@gmail.com。