摘要
采用大型有限元程序ANSYS对实桥进行建模,利用时程分析方法,考虑不同场地土、地震动输入、剪切波速等因素的影响,计算分析了桥梁结构使用铅销橡胶支座时,其地震反应值减震率的变化规律,提出了采用铅销橡胶支座进行桥梁减震设计的应用范围。研究结果表明,对于Ⅰ、Ⅱ类场地土,安装有铅销橡胶支座的减震设计桥梁具有良好的减震效果;对于Ⅲ、Ⅳ类场地土,采用相同设计方法的桥梁其减震效果不断降低,尤其当剪切波速小于140m/s后,使用铅销橡胶支座的减震桥梁已达不到减震的设计要求,应采取其他方法来降低桥梁结构的地震反应。
In this paper,considering different site conditions,earthquake motion,shear wave velocity and bearings,the changing trends of decreasing amplitude ratio of response are studied by finite element and time history analysis.The application range of isolation bridges with adopted lead-rubber-bearing is presented.Finally,it is concluded that performance of the isolation bridges with lead-rubber-bearing is excellent under the Ⅰ and Ⅱ kind of site condition,but its performance becomes worse under the Ⅲ and Ⅳ kind ...
出处
《世界地震工程》
CSCD
北大核心
2008年第2期106-110,共5页
World Earthquake Engineering
