摘要
针对大跨度桥梁纵向振动控制问题,提出新型黏滞-软钢阻尼器组合系统,旨在利用质量较小的黏滞阻尼器抵抗温度、列车行车荷载、制动力、风及小地震作用,利用软钢阻尼器抵御大地震作用。首先,从概念上阐述黏滞-软钢阻尼器组合系统的工作机理;其次,以我国某特大铁路悬索桥设计方案为例,合理选择组合系统中黏滞阻尼器和软钢阻尼器的设计参数,并分别验证两者单独使用下的减振(震)效果;最后,对组合系统在各种动力荷载作用下的减振(震)效果进行分析,讨论系统锁定的延时效应。研究结果表明:新型黏滞-软钢阻尼器组合系统在列车行车荷载、制动力、风以及地震作用下的减振(震)效果良好,可实现组合系统的设计理念;组合系统的锁定延时会使主梁位移产生不利于减震设计的偏移,在实际工程中应尽量减小此效应。
To solve the longitudinal vibration control problems of long-span bridges,the concept of a novel combined system of viscous and steel dampers was proposed,which aimed to use small tonnage viscous dampers to resist temperature,train moving load,braking force,wind force and small earthquakes,and steel dampers was used to defend rare earthquakes.Firstly,the working mechanism of the combined system of viscous and steel dampers was conceptually explained.Secondly,taking the design scheme of a super long-span railway suspension bridge in China as an example,the design parameters of the viscous damper and the steel damper in the combined system were reasonably selected,and the vibration reduction effects of the two were verified respectively.Finally,the vibration reduction effects of the combined system under various dynamic loads were analyzed,and locking delay effect of the damper system was studied.The results indicate that the novel combined system of viscous and steel dampers is effective in controlling structural vibration under train moving load,braking force,wind force and during earthquakes,which means that the design concept of the combined system can be realized;the locking delay effect will cause the shift displacement of the girder which is unfavorable to seismic reduction design and should be minimized in actual design.
作者
杨孟刚
胡尚韬
胡仁康
陈政清
YANG Menggang;HU Shangtao;HU Renkang;CHEN Zhengqing(School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第2期547-559,共13页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51978667)
中国铁路总公司科技研究开发计划重点课题(N2018G070)
中南大学研究生自主探索创新项目(2021zzts0242)。
关键词
黏滞阻尼器
软钢阻尼器
组合系统
概念设计
减振(震)
锁定延时
viscous damper
steel damper
combined system
conceptual design
vibration/seismic reduction
locking delay effect
