摘要
天津永定新河特大桥北引桥位于天津塘沽区,地震基本烈度为8度、设计基本地震加速度值为0.20g。为了解决其抗震问题,采用了铅芯隔震橡胶支座隔震技术。本研究通过采用有限元软件ANSYS对北引桥进行有限元动力分析,对桥梁在隔震、非隔震两种状态下的地震反应进行了时程分析,对支座的参数进行了优化,通过对分析结果的对比,从理论上验证了铅芯隔震橡胶支座的隔震效果。结果表明,铅芯隔震橡胶支座可以有效地降低天津永定新河特大桥北引桥的地震力,提高桥梁的安全性。
Lead rubber isolators（LRB） have become to be generally used for bridges as effective devices to enhance the seismic resistance.In this paper,the isolated effect analysis study on the Tianjing Yongding new river bridge using LRB is conducted.The equivalent stiffness,damping constant and yield force are optimized.Compared with no-isolated and isolated structure,the best isolation effect of lead rubber bearing to the total bridge structural associated with the characteristics of the input seismic ground motion is also directly confirmed.
出处
《工程抗震与加固改造》
北大核心
2010年第6期48-53,共6页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(50708041)
关键词
铅芯隔震橡胶支座
数值分析
等效刚度
等效阻尼系数
lead rubber bearing
numeric analysis
effective stiffness
effective damping ratio
