摘要
以某大跨超长连续梁桥为工程背景,研究Lock-up装置、粘滞阻尼器对该桥纵向抗震性能的影响。结构地震响应分析全部采用非线性动力时程分析方法。首先改变结构基本周期,分析并比较安装Lock-up装置前后不同基本周期结构的地震响应,结果表明:安装Lock-up装置前后结构基本周期对应的反应谱值差值越小,Lock-up装置对该结构的减震效果就越明显。然后对设置粘滞阻尼器的桥梁体系进行阻尼系数和阻尼指数的参数敏感性分析,分析表明:适当的选择阻尼系数和阻尼指数可以有效的降低结构地震响应。
The study examined the seismic behavior of a long-span continuous beam bridge focused on the influence of Lock-up device and viscous damper on its longitudinal seismic response.The nonlinear dynamic time-history analysis was applied in the seismic analysis.Firstly,the fundamental periods of the structure were changed,seismic response of structure with different fundamental periods was analysed and compared before and after applying of the Lock-up devices.The analysis shows that the Lock-up device will be more efficient when the difference of the response spectrum value corresponding to different period due to applying of the Lock-up device is much smaller.Secondly,a parameter sensitivity analysis of damping coefficient C and damping exponentαof a structure with damper was carried on.The parameter sensitivity analysis indicates that the reasonable C andαcan reduce the seismic response of the structure effectively.
出处
《北方交通》
2010年第12期31-34,共4页
Northern Communications
关键词
大跨超长连续梁桥
LOCK-UP装置
粘滞阻尼器
纵向抗震设计
Long-span continuous beam bridges
Lock-up device
Viscous damper
Seismic design in longitudinal direction
