高烈度区连续梁桥减震的粘滞阻尼器参数分析  

Parametric analysis of viscous dampers for earthquake mitigation of continuous bridges in high intensity region

作　　者：邓稳平[1] 王浩[1] 李爱群[1] 柳建设 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]西安市政设计研究有限公司,西安710068

出　　处：《振动与冲击》2012年第16期92-97,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50908046);东南大学优秀青年教师教学科研资助计划资助;江苏省高校优势学科建设工程资助项目;东南大学高校基本科研业务费项目(Seucx201106)

摘　　要：连续梁桥应用广泛,其损害占据桥梁工程地震灾害中的重要部分,有必要对连续梁桥进行专门的抗震设计,而安装粘滞阻尼器是改善桥梁结构抗震性能的有效手段之一。以位于地震高烈度区的太白大桥为例,通过有限元计算研究了设置粘滞阻尼器对预应力混凝土连续梁桥地震响应的影响,并重点针对阻尼器的阻尼系数和速度指数进行参数分析。结果表明:设置阻尼器后,固定墩墩底弯矩、边墩主梁相对位移都显著减小;各墩受力更趋均匀;阻尼器阻尼力随阻尼系数C增大而增大,随速度指数α增大而减小。所得结论可供高烈度区连续梁桥的减震设计参考。Installing viscous dampers is one of the effective measures to improve the seismic pertbrmance of continuous bridges. Taking the Taibai Bridge located in high-intensity seismic zone as an example, the influence of viscous dampers on seismic responses of a prestressed concrete continuous bridge was investigated, and the parametric analyses of the damping coefficient and velocity exponent were carried out. Results show that both the bending moment at the bottom of the fixed pier and the longitudinal relative displacement between the main girder and the side pier are significantly reduced when the viscous dampers have been installed. Moreover, the seismic forces on the piers become more evenly distributed. The damping forces of the dampers increase with the increase of damping coefficient, and decrease with the increase of velocity exponent. The results can provide reference to seismic design of continuous bridges in high intensity region.

关 键 词：连续梁桥 粘滞阻尼器 地震响应 非线性时程分析 减震 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]