摘要
针对桥梁固定支座剪断后地震位移无法控制的问题,提出采用黏滞流体阻尼器(FVD)进行抗震加固的方法。以某连续梁桥为背景,采用非线性时程动力分析方法对FVD的加固方式与参数选取进行分析。结果表明:固定支座有可能在桥墩出现塑性铰之前发生破坏;分散设置FVD可更有效地控制支座地震位移,且对桥墩的地震内力影响不大,可作为桥梁支座剪断后的抗震加固方法;阻尼系数和速度指数是FVD的主要参数,应从抗震加固性能与工程造价两方面进行比选,在满足支座位移与桥墩内力可控的前提下,应选择阻尼系数较小、速度指数较大的FVD进行抗震加固。
When the fixed bearings fail,the seismic-induced displacements of the bridge are difficult to control.To address this issue,the fluid viscous dampers(FVD)are proposed for seismic strengthening.Based on a continuous girder bridge,a non-linear time-history dynamic analysis method was employed to figure out how to use FVD for strengthening and the related parameters.The results show that fixed bearings are likely to fail before the occurrence of plastic hinges in the piers.Scattered FVDs can effectively control the seismic-induced displacements of the bearings and have minor influence on the seismic resistance of piers,which can be taken as a strengthening method after the failure of bearings in an earthquake event.The damping coefficient and speed index are the primary parameters of FVD,and seismic strengthening performance and costs are the two major concerns in implementing the FVD solution.If the utilization of FVDs allows the displacements of bearings to meet the requirements and the internal forces of piers under control,it is better to choose the FVDs with relatively small damping coefficient and big speed index for seismic strengthening.
作者
曹凤华
刘畅
CAO Feng-hua;LIU Chang(CCCC First Highway Consultants Co.,Ltd.,Xi′an 710075,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2021年第1期95-100,共6页
Bridge Construction
关键词
连续梁桥
抗震性能
固定支座
黏滞流体阻尼器
阻尼系数
速度指数
抗震加固
时程分析
continuous girder bridge
seismic performance
fixed bearing
fluid viscous damper
damping coefficient
speed index
seismic strengthening
time-history analysis
作者简介
曹凤华,1978-,男,高级工程师2003年毕业于长安大学桥梁工程专业,工学学士。研究方向:桥梁结构设计与咨询,E-mail:19607050@qq.com;刘畅,1981-,男,高级工程师2004年毕业于长安大学桥梁工程专业,工学学士。研究方向:桥梁结构设计与咨询,E-mail:492227961@qq.com。
