【摘要】 连续梁桥一般采用减隔震支座组成隔震支座体系进行抗震设计,不同的支座布置方式决定着结构的抗震性能与工程造价两个工程建设中主要关注的因素。在简要介绍铅芯橡胶支座的基础上,针对所有支座均设置铅芯橡胶支座以及组合使用铅芯橡胶支座与滑板支座的隔震方案,脉冲与非脉冲的两组不同地震动下,采用两种不同墩高,对墩高一致的三跨连续梁桥建立三维有限元模型进行地震响应计算,并对抗震性能与经济性进行了分析研究。结果表明,采用普通的滑板支座与铅芯橡胶联合使用同样能够获得较好的抗震性能,能有效地减少工程造价,节约成本;并且隔震支座的布置位置、墩高以及地震动输入的脉冲特性对隔震性能与经济性影响较大,对于墩高不大以及墩高基本一致的连续梁桥,当边墩设置隔震支座而中墩采用普通支座的情况下能获得良好的抗震性能与经济效益。更多还原

【Abstract】 The use of isolation bearing in supporting system is the main seismic isolation measures used in multi-span continuous girder bridges.It will lead to different seismic performance and economical efficiency for bridges when the bearing arrangement is different.This paper makes an introduction to the lead rubber bearing,and an analytical study on the performance and economical efficiency of seismically isolated bridge structures under the condition that all or part of bearings are lead rubber bearings subjected to earthquake excitation,with pulse and non-pulse,is conducted.The change of pier height is taken into consideration.The study shows that the scheme,in which part of bearing is lead rubber bearing,performs as well as all bearing is lead rubber bearing,and furthermore it has high economical efficiency;The location of seismic bearing,height of pier and pulse characteristic are decisive for seismic and economic performance.When the bearing is located on the side pier of bridge with low and about the same height of piers will have high performance.更多还原